JP2008224632A - Method for measuring impact absorption energy using dropping weight type impact testing machine, and dropping weight type impact testing machine - Google Patents

Method for measuring impact absorption energy using dropping weight type impact testing machine, and dropping weight type impact testing machine Download PDF

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JP2008224632A
JP2008224632A JP2007067684A JP2007067684A JP2008224632A JP 2008224632 A JP2008224632 A JP 2008224632A JP 2007067684 A JP2007067684 A JP 2007067684A JP 2007067684 A JP2007067684 A JP 2007067684A JP 2008224632 A JP2008224632 A JP 2008224632A
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weight
falling weight
impact
test piece
absorption energy
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Noboru Nishiyama
暢 西山
Toshiro Izumi
寿郎 和泉
Takanobu Hosokawa
孝信 細川
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JFE Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for testing impact of dropping weight type that measures impact absorption energy and is suited for a DWTT test especially, in conformance with API standards, and a machine for testing impact of dropping weight used for it. <P>SOLUTION: The method for measuring impact absorption energy using the machine for testing impact of dropping weight, measures the impact absorption energy of a test specimen by using the kinetic energy when a dropping weight is freely fallen without colliding the weight to the test specimen and the kinetic energy after the weight is collided to the test specimen and the test specimen is broken. The machine comprises the weight, a dropping weight guidance mechanism having a mechanism for moving and holding the weight in the vertical direction, a speed detector for detecting the speed of the weight that falls, and a speed detection mechanism having a pass-detection sensor for detecting that the weight felt on the lower side of the stand of the test specimen. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、落錘式衝撃試験方法における材料の衝撃吸収エネルギーを測定する方法およびそれに用いる落錘式衝撃試験機に関し、特にＡＰＩ規格に準じたＤＷＴＴ試験に好適なものに関する。   The present invention relates to a method for measuring the impact absorption energy of a material in a drop weight type impact test method and a drop weight type impact tester used therefor, and particularly to a suitable one for a DWTT test according to API standards.

試料に落錘により衝撃を与えてその強度や靭性を測定する衝撃破壊試験法が材料評価試験として、各分野で用いられている。   An impact fracture test method in which an impact is applied to a sample by a falling weight and its strength and toughness are measured is used as a material evaluation test in various fields.

例えば、鉄鋼分野では市販の落錘型ＤＷＴＴ試験機などの落錘式衝撃試験機が用いられ、半導体分野ではハード磁気ディスク装置のディスクの強度を測定する方法として、特許文献１により衝撃破壊試験が提案されている。   For example, a drop weight type impact tester such as a commercially available drop weight type DWTT tester is used in the steel field, and in the semiconductor field, as a method for measuring the strength of a disk of a hard magnetic disk device, an impact fracture test is performed according to Patent Document 1. Proposed.

また、特許文献２は、「動的荷重計測装置」に関し、自動車の衝撃吸収部材の動的な変形特性を、試験体に落錘を衝突させて測定する方法を提案している。   Patent Document 2 relates to a “dynamic load measuring device” and proposes a method of measuring the dynamic deformation characteristics of an automobile impact absorbing member by causing a falling weight to collide with a test body.

市販の落錘型ＤＷＴＴ試験機では試験機の落錘を除く部分に落錘の変位測定器及び落錘に検力器を取り付け、落錘が試験片に衝突した時刻(ｔ1)から当該衝突が完了するまでの時刻(t2)までの間の落錘の変位(ｘ(t))、落錘が受ける力(F(t))を微小時間ごとに同時に測定し、積分値Ｅを衝撃吸収エネルギーとしている。   In a commercially available drop weight type DWTT tester, a drop weight displacement measuring device is attached to a portion of the test machine excluding the drop weight, and a force sensor is attached to the drop weight, and the collision occurs from the time (t1) when the drop weight collides with the test piece. The displacement of the falling weight (x (t)) and the force (F (t)) received by the falling weight until the completion time (t2) are measured at the same time every minute, and the integral value E is the shock absorption energy. It is said.

Figure 2008224632
特許文献１記載の「衝撃破壊試験方法及び装置」は、ハード磁気ディスク装置のディスクに衝突直前の落錘速度(ｖ1)と衝突完了時の速度(v2)から落錘の運動量変化ｍ(v1−ｖ2)を計算し(ｍは落錘の質量)、得られた値を落錘が試験片につけた圧痕の体積Ｖで除した単位体積当たり運動量変化を衝撃強さとして定義し測定している。
特開平０８−１３６４２９号公報 特開２００６−２８４５１５号公報
Figure 2008224632
 The “impact fracture test method and apparatus” described in Patent Document 1 is based on the weight drop velocity (v1) immediately before the collision and the velocity (v2) at the time of collision completion on the disk of the hard magnetic disk device. v2) is calculated (m is the mass of the falling weight), and the change in the momentum per unit volume obtained by dividing the obtained value by the volume V of the indentation on the test piece by the falling weight is defined and measured as the impact strength.
Japanese Patent Laid-Open No. 08-136429 JP 2006-284515 A

ところで、落錘を用いた衝撃破壊試験法の場合、落錘が試験片に衝突するときの速度が大きく、落錘の形状によっては衝突時に受ける衝撃的な外力による弾性波の反射などが検力器の検力精度に影響を及す。   By the way, in the impact fracture test method using a falling weight, the speed at which the falling weight collides with the test piece is large, and depending on the shape of the falling weight, the reflection of elastic waves due to the impact external force received at the time of collision is the test force. This will affect the accuracy of the detector.

そのため、特許文献２では、弾性波反射に対して円筒形荷重検出器の直径Ｄと長さＬの比を０．３≦L/Ｄ≦３の範囲に限定している。   Therefore, in Patent Document 2, the ratio of the diameter D and the length L of the cylindrical load detector is limited to the range of 0.3 ≦ L / D ≦ 3 with respect to the elastic wave reflection.

例えば、ＡＰＩ規格に準じるＤＷＴＴ試験の場合、落錘が試験片に衝突するときの速度は９ｍ/ｓと大きく、市販の落錘型ＤＷＴＴ試験機では、落錘が試験片に衝突している約１０ｍｓの微小時間内に変位測定器と検力器の各変位及び力をもとに力×微小変位を積分計算して衝撃吸収エネルギーとしているが、１．高度な分解能と時間応答性を有する変位測定器及び検力計を必要とするため高コストである。   For example, in the case of a DWTT test according to the API standard, the speed at which the falling weight collides with the test piece is as high as 9 m / s. In a commercially available falling weight type DWTT tester, the falling weight is about to collide with the test piece. The impact absorption energy is calculated by integrating the force x minute displacement based on the displacement and force of the displacement measuring instrument and the force sensor within a minute time of 10 ms. Since a displacement measuring instrument and a dynamometer having high resolution and time response are required, the cost is high.

２．微小時間内に変位測定器と検力器の各変位及び力から力×微小変位を積分計算するため、高度な記憶容量と時間応答性を有する計算機を必要とし高コストである。   2. In order to integrate and calculate force x minute displacement from each displacement and force of the displacement measuring instrument and the force sensor within a minute time, a computer having a high storage capacity and time response is required and the cost is high.

３．動的測定で得られたエネルギーはそれが正しいことを実証する絶対標準がないので、これらの測定で得られたエネルギーは同一試験機内での相対比較にとどまらざるを得ない。   3. Since the energy obtained with dynamic measurements has no absolute standard to prove that it is correct, the energy obtained with these measurements has to be a relative comparison within the same tester.

更に、一般的に測定の不確かさは測定から計算までのプロセスが多いほど増加すると考えられので、市販の落錘型ＤＷＴＴ試験機でＡＰＩ規格に準じたＤＷＴＴ試験を実施する場合は測定器及び計算機の校正、精度維持などに多くの労力を要する。   Furthermore, it is generally considered that the measurement uncertainty increases as the number of processes from measurement to calculation increases. Therefore, when a DWTT test according to the API standard is performed with a commercially available drop weight type DWTT tester, the measurement instrument and the computer Requires a lot of labor to calibrate and maintain accuracy.

尚、特許文献１記載の「衝撃破壊試験方法及び装置」は衝突直前の落錘速度(ｖ1)と衝突完了時の速度(v2)から落錘の運動量変化ｍ(v1−ｖ2)を計算し(ｍは落錘の質量)、これを落錘が試験片につけた圧痕の体積Ｖで除した単位体積当たり運動量変化を衝撃強さとして定義し測定しているため、
１）Ｊの単位で表現されるべき衝撃吸収エネルギーの測定には利用できない。
２）速度及び圧痕という二つの測定値をもとにして特性値を計算しているため、各測定の不確かさが特性値の不確かさに影響を及ぼす。ため、ＤＷＴＴ試験には適用できない。 The “impact fracture test method and apparatus” described in Patent Document 1 calculates the momentum change m (v1−v2) of the falling weight from the falling weight speed (v1) immediately before the collision and the speed (v2) at the time of the completion of the collision ( m is the mass of the falling weight), and the change in momentum per unit volume divided by the volume V of the indentation applied to the test piece by the falling weight is defined and measured as impact strength.
1) It cannot be used for the measurement of shock absorption energy that should be expressed in J units.
2) Since the characteristic value is calculated based on two measured values of speed and indentation, the uncertainty of each measurement affects the uncertainty of the characteristic value. Therefore, it cannot be applied to the DWTT test.

また、従来から振子式衝撃試験機による衝撃吸収エネルギー測定方法がＪＩＳ Ｚ２２４２「金属材料衝撃試験方法」などに定められている。   Conventionally, a method for measuring impact energy absorption by a pendulum impact tester is defined in JIS Z2242 “Metallic material impact test method” and the like.

振子式衝撃試験機は試験前の振子角度と試験後の振子角度という静的に測定可能なひとつの物理量である角度をもとに衝撃吸収エネルギーを計算するため測定の不確かさはよいが次に掲げる欠点をもつ。
１）振子の位置エネルギーは振子の支点から振子の重心までの長さと振子の質量で定まるため、衝突現象の可変要素である衝突速度と衝突物体の質量とを独立に可変化することが煩雑である。
２）振子を鉛直面内で回転させるための回転軸保持機能の堅牢性が重要であるため、同一ひょう量の場合、落錘式より大がかりな装置構成を要し高コストである。 The pendulum type impact tester calculates the shock absorption energy based on the angle that is one of the statically measurable quantities of the pendulum angle before the test and the pendulum angle after the test. Has the disadvantages listed below.
1) Since the potential energy of the pendulum is determined by the length from the pendulum fulcrum to the pendulum's center of gravity and the mass of the pendulum, it is complicated to independently vary the collision speed and the mass of the collision object, which are variables of the collision phenomenon is there.
2) Since the robustness of the rotary shaft holding function for rotating the pendulum in the vertical plane is important, in the case of the same weighing capacity, a larger apparatus configuration than the falling weight type is required and the cost is high.

そこで、本発明は上述した課題を解決する、ＡＰＩ規格に準じるＤＷＴＴ試験等、材料の衝撃吸収エネルギーを測定する落錘式衝撃試験方法およびそれに用いる落錘式衝撃試験機を提供することを目的とする。   Accordingly, the present invention aims to provide a falling weight type impact test method for measuring the impact absorption energy of a material, such as a DWTT test according to the API standard, and a falling weight type impact test machine used therefor, which solve the above-described problems. To do.

本発明の課題は以下の手段で達成可能である。
１．落錘式衝撃試験機を用いた衝撃吸収エネルギーの測定方法であって、落錘を試験片に衝突させずに自由落下させた際の運動エネルギーと、落錘が試験片に衝突し、破断させた後の運動エネルギーを用いて、当該試験片の衝撃吸収エネルギーを測定することを特徴とする落錘式衝撃試験機を用いた衝撃吸収エネルギーの測定方法。
２．落錘と、落錘を鉛直方向に移動させ保持する機構と試験片置き台を有する落錘案内機構と、落下する落錘の速度を検出する速度検出器と前記落錘が前記試験片置き台の下方に落下したことを検知する通過検出センサーを有する速度検出機構を備えた落錘式衝撃試験機。 The object of the present invention can be achieved by the following means.
1. This is a method for measuring the impact absorption energy using a drop weight type impact tester, and the kinetic energy when the drop weight is dropped freely without colliding with the test piece, and the drop weight collides with the test piece and breaks it. A method for measuring shock absorption energy using a falling weight type impact tester, characterized in that the impact absorption energy of the test piece is measured using the kinetic energy after the test.
2. A falling weight, a mechanism for moving and holding the falling weight in the vertical direction, a falling weight guide mechanism having a test piece table, a speed detector for detecting the speed of the falling weight, and the falling weight are the test piece table. A falling weight type impact testing machine equipped with a speed detection mechanism having a passage detection sensor for detecting that the vehicle has fallen below.

本発明によれば、市販の落錘型ＤＷＴＴ試験機に対し
１．測定対象の物理量は速度だけであり、ふたつの物理量である変位及び力を測定する方法より測定精度に優れる。
２．変位及び力の線図をスムージング、積分することに起因する不確かさ要因を排除できる。
３．落錘の形状設計にあたって弾性波動現象に対する制約がない。
４．高度な分解能と時間応答性を有する検力計及び高度な記憶容量と時間応答性を有する計算機が不要であり低コストである。
５．速度計を絶対標準に参照して校正しておくだけでエネルギーの絶対精度が保証できるので、校正や精度維持にかかわる労力を低減でき、かつ異なる試験機間での測定値又は振子式試験機での測定値などとも相対比較可能である。 According to the present invention, for a commercially available falling weight type DWTT tester: The physical quantity to be measured is only the speed, and the measurement accuracy is superior to the method of measuring the displacement and force, which are two physical quantities.
2. Uncertainty factors resulting from smoothing and integrating displacement and force diagrams can be eliminated.
3. There is no restriction on the elastic wave phenomenon in the shape design of the falling weight.
4). A dynamometer having high resolution and time responsiveness and a computer having high storage capacity and time responsiveness are not required and the cost is low.
5. By simply calibrating with reference to the speedometer, the absolute accuracy of the energy can be guaranteed, so the labor involved in calibration and maintaining the accuracy can be reduced, and measured values or pendulum type testers between different test machines can be used. It is also possible to make a relative comparison with the measured value.

本発明は、落錘を試験片に衝突させずに自由落下させた際の運動エネルギーと、落錘が試験片に衝突し、破断させた後の運動エネルギーを用いて、当該試験片の衝撃吸収エネルギーを測定することを特徴とする。   The present invention uses the kinetic energy when the falling weight is allowed to fall freely without colliding with the test piece, and the kinetic energy after the falling weight collides with the test piece and breaks, thereby absorbing the shock of the test piece. It is characterized by measuring energy.

図１は、本発明の実施に好適な落錘式衝撃試験機の一例を示し、図において１は落錘を鉛直方向に運動させるための落錘案内機構、２は質量ｍの落錘、３は試験片置き台、４は試験片、５はレーザードップラー速度計、６は通過検出センサー、７は落錘を鉛直上向きに上昇させる上昇装置、８は落錘２が通過検出センサー６を通過したことおよびその際にレーザードップラー速度計５で測定した速度を記憶し、運動エネルギーを算出する演算機構とその表示機能を備えたコントローラ、９は床面、１０は落錘２の重心、１１は落錘掴み具、ａ、ｂは信号線を示す。   FIG. 1 shows an example of a drop weight impact tester suitable for implementing the present invention. In the figure, 1 is a drop weight guide mechanism for moving the drop weight in the vertical direction, 2 is a drop weight of mass m, 3 Is a test specimen table, 4 is a test specimen, 5 is a laser Doppler velocimeter, 6 is a passage detection sensor, 7 is a lifting device that raises the falling weight vertically upward, and 8 is a falling weight 2 that has passed through the passage detection sensor 6. And a controller equipped with an arithmetic mechanism for calculating kinetic energy and a display function thereof, 9 for the floor surface, 10 for the center of gravity of the falling weight 2, and 11 for dropping A weight gripping tool, a and b indicate signal lines.

図示した落錘式衝撃試験機は、市販の落錘型ＤＷＴＴ試験機に準じた構造で、落錘案内機構１とレーザードップラー速度計５を保持する架台を有し、落錘案内機構１は床面９に固定され、レーザードップラー速度計５は、架台を介して、床面９に固定される。床面９は、地球上又は地球と剛体接続している。   The illustrated drop weight type impact tester has a structure according to a commercially available drop weight type DWTT tester, and has a platform for holding the drop weight guide mechanism 1 and the laser Doppler velocimeter 5, and the drop weight guide mechanism 1 is a floor. The laser Doppler velocimeter 5 is fixed to the floor 9 via a gantry. The floor surface 9 is rigidly connected to the earth or the earth.

落錘案内機構１は、2本の間隔を有して直立する柱部材を有し、前記柱部材には、その上方から下方に向かって、落錘２の上昇装置７、落錘２の掴み具１１、試験片置き台３を有し、試験片置き台３の下方には、落下する落錘２が通過したことを検知する通過検出センサー６が、落錘２や破断した試験片４と干渉しない位置に取り付けられる。   The falling weight guide mechanism 1 has a column member that stands upright with two intervals, and the column member includes a lifting device 7 for dropping the falling weight 2 and a gripping of the falling weight 2 from above to below. The test piece holder 3 is provided below the test piece holder 3, and a passage detection sensor 6 for detecting that the falling weight 2 has passed is provided with the drop weight 2 and the broken test piece 4 It can be installed at a position that does not interfere.

レーザードップラー速度計５を保持する架台は、レーザードップラー速度計５が落下する落錘２の速度をその上方から測定できるように、床面９に固定される。
ここで、上記落錘式衝撃試験機で試験片が有る時と無い時の落錘の高さと速度の関係を模式的に示すと図２のようになる。 The gantry holding the laser Doppler velocimeter 5 is fixed to the floor 9 so that the speed of the falling weight 2 on which the laser Doppler velocimeter 5 falls can be measured from above.
Here, FIG. 2 schematically shows the relationship between the height and speed of the falling weight when the test piece is present and when there is no test piece.

以下、図示した落錘式衝撃試験機を用いて、ＤＷＴＴ試験等試験片の衝撃吸収能を測定する手順を説明する。
１．まず試験片置き台３に試験片を置かない状態で、落錘２を落錘２の重心１０が通過検出センサー６より鉛直上向きにＨだけ高くなるように上昇装置７で揚げ、落錘掴み具１１に落錘２を掴ませて高さＨを保持する。 Hereinafter, a procedure for measuring the impact absorbing ability of a test piece such as a DWTT test using the falling weight type impact tester illustrated will be described.
1. First, in a state in which the test piece is not placed on the test piece placing table 3, the drop weight 2 is lifted by the lifting device 7 so that the center of gravity 10 of the drop weight 2 is higher than the passage detection sensor 6 by H in the vertical direction. 11 holds the falling weight 2 to maintain the height H.

２．落錘掴み具１１と落錘２との掴み状態を解除し、落錘２を空気抵抗及び落錘案内機構１からの摩擦を受けながら鉛直下向きにほぼ自由落下させる。   2. The gripping state of the falling weight gripping tool 11 and the falling weight 2 is released, and the falling weight 2 is almost freely dropped vertically downward while receiving air resistance and friction from the falling weight guide mechanism 1.

３．落錘２が通過検出センサー６の高さまで落下したことを信号線ｂでコントローラ８に伝達し、そのときの速度ｖ1をレーザードップラー速度計５で測定し、信号線ａで伝達し、コントローラ８で運動エネルギーを演算し、表示する。   3. The fact that the falling weight 2 has fallen to the height of the passage detection sensor 6 is transmitted to the controller 8 through the signal line b, and the velocity v1 at that time is measured by the laser Doppler velocimeter 5 and transmitted through the signal line a. Calculate and display kinetic energy.

重力加速度をｇ、空気抵抗及び落錘案内機構１からの摩擦によるエネルギー損失をＥ１とすると、力学的エネルギー保存則より式(１)が成立する。   When the acceleration of gravity is g, and the energy loss due to air resistance and friction from the drop weight guide mechanism 1 is E1, Equation (1) is established from the mechanical energy conservation law.

ｍｇＨ−Ｅ１＝１／２ｍ(ｖ１)２ (１)
４．次に落錘２を落錘２の重心１０が通過検出センサー６より鉛直上向きにＨだけ高くなるように上昇装置７で揚げ、落錘掴み具１１に落錘２を掴ませて高さＨを保持してから試験片４を試験片置き台３に置き、落錘掴み具１１と落錘２との掴み状態を解除する
５．落錘２を空気抵抗及び落錘案内機構１からの摩擦を受けながら鉛直下向きにほぼ自由落下し試験片４を破壊し再度落下させる。 mgH-E1 = 1 / 2m (v1) 2 (1)
4). Next, the falling weight 2 is lifted by the lifting device 7 so that the center of gravity 10 of the falling weight 2 is higher than the passage detection sensor 6 by H, and the falling weight gripping tool 11 holds the falling weight 2 to increase the height H. 4. After holding, place the test piece 4 on the test piece placing table 3 and release the gripping state between the falling weight gripping tool 11 and the falling weight 2. While the falling weight 2 is subjected to air resistance and friction from the falling weight guide mechanism 1, the drop weight 2 is almost freely dropped downward to break the test piece 4 and drop it again.

６．落錘２が通過検出センサー６の高さまで落下したことを信号線ｂでコントローラ８に伝達し、そのときの速度ｖ２をレーザードップラー速度計５で測定し、信号線ａを伝達してコントローラ８で運動エネルギーを演算し、表示する。   6). The fact that the falling weight 2 has fallen to the height of the passage detection sensor 6 is transmitted to the controller 8 through the signal line b, the speed v2 at that time is measured by the laser Doppler velocimeter 5, and the signal line a is transmitted through the controller 8 Calculate and display kinetic energy.

重力加速度をｇ、空気抵抗及び落錘案内機構１からの摩擦によるエネルギー損失をＥ１、試験片４の破壊に費やされたエネルギーすなわち試験片４の衝撃吸収エネルギーをＥ２とすると、力学的エネルギー保存則より式(２)が成立する。   Mechanical energy conservation, where g is the gravitational acceleration, E1 is the energy loss due to air resistance and friction from the drop weight guide mechanism 1, and E2 is the energy consumed to destroy the test piece 4, that is, the shock absorption energy of the test piece 4 Equation (2) is established from the law.

ｍｇＨ−Ｅ１−Ｅ２＝１／２ｍ(ｖ２)２ (２)
式（１）及び式（２）より式(３)が導出され衝撃吸収エネルギーＥ２は
変数として速度だけをもつ単純な式であらわされる。 mgH-E1-E2 = 1/2 m (v2) 2 (2)
Expression (3) is derived from Expression (1) and Expression (2), and the impact absorption energy E2 is expressed by a simple expression having only speed as a variable.

Ｅ２＝１／２ｍ{(ｖ１)２− (ｖ２)２} (３)
上述したように、本発明によれば、落錘の速度のみを検出し、落錘を試験片に衝突させずに自由落下させた際の運動エネルギーと、落錘が試験片に衝突し、破断させた後の運動エネルギーを用いて、当該試験片の衝撃吸収エネルギーを測定するので、測定精度に優れ、且つ安価な装置構成が可能である。 E2 = 1/2 m {(v1) 2 − (v2) 2 } (3)
As described above, according to the present invention, only the speed of the falling weight is detected, and the kinetic energy when the falling weight is allowed to fall freely without colliding with the test piece, and the falling weight collides with the test piece and breaks. Since the impact absorption energy of the test piece is measured using the kinetic energy after the treatment, an apparatus configuration with excellent measurement accuracy and low cost is possible.

本発明は装置構成における通過検出センサー６、レーザードップラー速度計５の配置を適宜変更することでＤＷＴＴ試験のみならず、衝撃吸収エネルギにより、材料特性の評価を行う各種試験に適用することが可能である。   The present invention can be applied not only to the DWTT test by appropriately changing the arrangement of the passage detection sensor 6 and the laser Doppler velocimeter 5 in the apparatus configuration, but also to various tests for evaluating material properties by using shock absorption energy. is there.

本発明の一実施例に係る落錘式衝撃試験機の構成を示す概略図。Schematic which shows the structure of the falling weight type impact tester based on one Example of this invention. 落錘高さと落錘速度の関係を示す図。The figure which shows the relationship between falling weight height and falling weight speed.

符号の説明Explanation of symbols

１ 落錘案内機構
２ 落錘
３ 試験片置き台
４ 試験片
５ レーザードップラー速度計
６ 通過検出センサー
７ 上昇装置
８ コントローラ
９ 床面
１０ 重心
１１ 落錘掴み具
ａ、ｂ 信号線 DESCRIPTION OF SYMBOLS 1 Drop weight guide mechanism 2 Drop weight 3 Test piece stand 4 Test piece 5 Laser Doppler velocimeter 6 Passing detection sensor 7 Lifting device 8 Controller 9 Floor surface 10 Center of gravity 11 Drop weight gripping tool a, b Signal line

Claims (2)

落錘式衝撃試験機を用いた衝撃吸収エネルギーの測定方法であって、落錘を試験片に衝突させずに自由落下させた際の運動エネルギーと、落錘が試験片に衝突し、破断させた後の運動エネルギーを用いて、当該試験片の衝撃吸収エネルギーを測定することを特徴とする落錘式衝撃試験機を用いた衝撃吸収エネルギーの測定方法。   This is a method for measuring the impact absorption energy using a drop weight type impact tester, and the kinetic energy when the drop weight is dropped freely without colliding with the test piece, and the drop weight collides with the test piece and breaks it. A method for measuring shock absorption energy using a falling weight type impact tester, characterized in that the impact absorption energy of the test piece is measured using the kinetic energy after the test. 落錘と、落錘を鉛直方向に移動させ保持する機構と試験片置き台を有する落錘案内機構と、落下する落錘の速度を検出する速度検出器と前記落錘が前記試験片置き台の下方に落下したことを検知する通過検出センサーを有する速度検出機構を備えた落錘式衝撃試験機。   A falling weight, a mechanism for moving and holding the falling weight in the vertical direction, a falling weight guide mechanism having a test piece table, a speed detector for detecting the speed of the falling weight, and the falling weight are the test piece table. A falling weight type impact testing machine equipped with a speed detection mechanism having a passage detection sensor for detecting that the vehicle has fallen below.
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