CN103344480B - Device for testing crack growth and residual strength of thin-wall plate with stringers - Google Patents
Device for testing crack growth and residual strength of thin-wall plate with stringers Download PDFInfo
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- CN103344480B CN103344480B CN201310239499.7A CN201310239499A CN103344480B CN 103344480 B CN103344480 B CN 103344480B CN 201310239499 A CN201310239499 A CN 201310239499A CN 103344480 B CN103344480 B CN 103344480B
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Abstract
The invention discloses a device for testing crack growth and residual strength of a thin-wall plate with stringers. The device comprises buckling-resistant plates, out-of-plane blending-resistant T-shaped beams, reinforcing plates, connecting rods, chucks with adjustment grooves, a lug chuck and an adapter. A test piece is clamped by the lug chuck and the lug chuck is connected to a fatigue testing machine by the adapter so that the test piece is in a state that a load is uniformly distributed at a far-end; the chucks with the adjustment grooves are fixed to the fatigue testing machine; the buckling-resistant plate without a groove and the buckling-resistant plate with grooves are clamped in the center of the test piece and are arranged on the chucks with the adjustment grooves; the reinforcing plates are fixed to the buckling-resistant plates so that buckling-resistant plate rigidity is improved; and the connecting rods are inset into the out-of-plane blending-resistant T-shaped beams and through the adjustment grooves, positions of the connecting rods can be adjusted so that the out-of-plane blending-resistant T-shaped beams closely cling to the buckling-resistant plates and thus test piece out-of-plane blending is prevented. The device is simple and practical, can be installed easily, can effectively complete a crack growth and residual strength test on a thin-wall plate with stringers, is suitable for different types of thin-wall plates with stringers, and has high test efficiency and obvious economical efficiency.
Description
Technical field
The invention belongs to the technical field of structures of product, relate to a kind of for the device with stringer thin-walled part Crack Extension and residual intensity test.
Background technology
One of design cell of commonly using of aircraft manufacturing with stringer thin-walled part, Static Strength Design in the past requires the requirement no longer having met aeroplane structure design, nowadays aircraft allows to occur fatigue crack during use, when even allowing certain main force-summing element to produce fatigure failure, aircaft configuration still has enough residual intensities to continue carrying work, until can find existing fatigue damage and unlikelyly cause catastrophic consequence during maintenance next time, this just requires that aeroplane structure design meets damage tolerance design requirement.Crack Extension with stringer thin-walled part and residual intensity test are the important component parts of damage tolerance performance test, have listed the relevant examination code requirement of airplane design handbook and seaworthiness department in.
And current test unit can only meet the test request of simplification, standardization test specimen, the Crack Extension of dissimilar band stringer thin-walled part large-scale experiment part and residual intensity test and anti-buckling requirement cannot be met.
Summary of the invention
The technical problem to be solved in the present invention is: the deficiency existed for existing test unit and design a kind of for the device with stringer thin-walled part Crack Extension and residual intensity test, this device can carry out Crack Extension and residual intensity test to dissimilar band stringer thin-walled part, play effect that is anti-buckling and measurement test parameters, to study the impact of stringer on crack Propagation and residual intensity, the damage tolerance performance of stringer thin-walled part is analyzed.
Technical solution of the present invention is: test unit comprises anti-buckling plate, prevent the T-shaped beam of out-of-plane bending, stiffening plate connecting rod, band adjustment tank chuck, auricle chuck and adapter, band adjustment tank chuck is four pieces, be separately fixed on the pillar at testing machine two ends, two connecting rods are connected on band adjustment tank chuck perpendicular to the pillar at testing machine two ends, prevent from the T-shaped beam of out-of-plane bending has the groove identical with connecting rod thickness, connecting rod embeds in the groove prevented on the T-shaped beam of out-of-plane bending, two blocks of anti-buckling plates are parallel to connecting rod and are placed on band adjustment tank chuck, the xsect of anti-buckling plate is U-shaped, the bottom surface of anti-buckling plate has the elongated slot corresponding with stringer position on testpieces side by side, the degree of depth of elongated slot is greater than the height of long purlin on testpieces, the relative clamp assay part in bottom surface of two blocks of anti-buckling plates, the center of anti-buckling plate has crackle observation port, two ends have bolt connecting hole, the two ends of stiffening plate stride across crackle observation port by screw and are fixed on anti-buckling plate, the two ends of auricle grips testpieces are also fixed on testing machine by adapter.
Described a kind ofly to it is characterized in that for the device with stringer thin-walled part Crack Extension and residual intensity test, described anti-buckling plate holder is held in testpieces middle part, chooses corresponding anti-buckling plate according to stringer type.
Described is a kind of for the device with stringer thin-walled part Crack Extension and residual intensity test, it is characterized in that: the surface of contact of described connecting rod and band adjustment tank chuck has adjustment tank, mutually vertical with adjustment tank on band adjustment tank chuck with adjustment tank on connecting rod.
Described is a kind of for the device with stringer thin-walled part Crack Extension and residual intensity test, it is characterized in that: the length direction along connecting rod on described connecting rod arranges adjustment tank, and the adjustment tank on band adjustment tank chuck is vertical with the adjustment tank on connecting rod.
The advantage that the present invention has and beneficial effect are: test specimen, by auricle grips, is connected on fatigue tester by adapter, and test specimen can be made to obtain far-end uniformly distributed load, to meet the loading demands of test specimen test.The anti-buckling plate of slotless and the anti-buckling plate of trough of belt by screw by specimen holder in centre.Wherein, the bottom surface of the anti-buckling plate of trough of belt has the elongated slot corresponding with stringer position on testpieces side by side, the wallboard part of bottom surface to test specimen of anti-buckling like this plate can fit tightly, play effective anti-buckling effect, and beam portions can not be affected, this design simultaneously makes anti-buckling plate structure simple, and weight is little, rigidity is large, anti-buckling effective and be easy to processing.Stiffening plate is fixed by screws on anti-buckling plate, increases the rigidity of anti-buckling plate further.Prevent the T-shaped beam of out-of-plane bending to be close on anti-buckling plate by connecting rod, prevent test specimen generating plane outside sweep.Connecting rod is connected on band adjustment tank chuck, and band adjustment tank chuck is fixed on the pillar of testing machine both sides.Mutually perpendicular adjustment tank makes whole anti-buckling device can be close to the testpieces of different-thickness, and is easy to install.Provided by the invention a kind of for the test unit with stringer thin-walled part Crack Extension and residual intensity, be applicable to dissimilar band stringer thin-walled part, and anti-buckling effect is played to testpieces, complete the residual intensity test of crack expansion test under different stress ratio load and multiple Initial crack length, the related fracture mechanics parameters such as crack length, crack tip opening displacement, open-angle can be convenient for measuring, the impact of the On Crack Propagation behavior of experimental study stringer and residual intensity, for the damage tolerance performance analysis of band stringer thin-walled part provides foundation.The present invention is compared with existing apparatus, its advantage is that this test unit is simple, practical and easy for installation, not only effectively can complete band stringer thin-walled part Crack Extension and residual intensity test, and can test for dissimilar band stringer thin-walled part, testing efficiency and economy are given prominence to.
Accompanying drawing explanation
Fig. 1 is the formation schematic diagram of testpieces of the present invention and test unit.
Fig. 2 is test unit Facad structure schematic diagram of the present invention.
Fig. 3 is test unit structure schematic diagram of the present invention.
Fig. 4 is the structural representation of the anti-buckling plate of slotless in the present invention.
Fig. 5 is the structural representation containing two anti-buckling plates of groove in the present invention.
Fig. 6 is the structural representation containing three anti-buckling plates of groove in the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As Figure 1-3, test unit comprises anti-buckling plate 1, prevents the T-shaped beam 2 of out-of-plane bending, stiffening plate 3, connecting rod 4, is with adjustment tank chuck 5, auricle chuck 6 and adapter 7.Band adjustment tank chuck 5 is four pieces, and respectively by being bolted on the pillar 8 at testing machine two ends, fixing position need be determined according to the position at test specimen place.Two connecting rods 4 are connected on band adjustment tank chuck 5 perpendicular to the pillar 8 at testing machine two ends, prevent from the T-shaped beam of out-of-plane bending 2 has the groove 9 identical with connecting rod 4 thickness, connecting rod 4 embeds in the groove prevented on the T-shaped beam 2 of out-of-plane bending, two blocks of anti-buckling plates 1 are parallel to connecting rod 4 and are placed on band adjustment tank chuck 5, the xsect of anti-buckling plate 1 is U-shaped, the bottom surface of anti-buckling plate 1 has the elongated slot 10 corresponding with stringer position on testpieces side by side, the degree of depth of elongated slot is greater than the height of long purlin on testpieces, the relative clamp assay part in bottom surface of two blocks of anti-buckling plates 1, the center of anti-buckling plate 1 has crackle observation port 12, two ends have bolt connecting hole 13, the two ends of stiffening plate 3 stride across crackle observation port 12 by screw and are fixed on anti-buckling plate 1, the two ends of auricle chuck 6 clamp assay part 11 are also fixed on testing machine by adapter 7.
During test, by auricle chuck 6 clamping test pieces, for test specimen provides the evenly load meeting test condition, auricle chuck 6 can be connected on the testing machine of different model by adapter 7.Be fixed by screws on the pillar 8 of testing machine with adjustment tank chuck 5, fixing position is selected according to the position of test specimen, makes the crackle observation port 12 on anti-buckling plate 1 just can observe crackle.Anti-buckling plate 1 is held in the centre of test specimen by screw clamp, one side is the anti-buckling plate of slotless, one side outputs the anti-buckling plate with stringer corresponding groove, test specimen for different stringer type is selected to test containing the anti-buckling plate of different slots, middle crackle observation port 12 is used for measuring crack length, install and measure the strain gauge of breaking mechanics parameter, can measure and comprise crack mouth opening displacement and the breaking mechanics parameter such as crack tip opening displacement, open-angle.Stiffening plate 3 adopts high-strength steel to make, and strides across crackle observation port and is fixed by screws on anti-buckling plate 1, play the effect strengthening anti-buckling panel stiffness.Prevent the T-shaped beam 2 of out-of-plane bending from being fixed by the connecting rod 4 that can embed in its groove, play the effect preventing out-of-plane bending.Connecting rod 4 is also fixed by adjustment tank 14 and adjustment tank 15 adjusting position, makes to prevent the T-shaped beam of out-of-plane bending 2 to be close to anti-buckling plate 1.
Claims (4)
1. one kind for the device with stringer thin-walled part Crack Extension and residual intensity test, it is characterized in that, test unit comprises anti-buckling plate (1), prevent the T-shaped beam of out-of-plane bending (2), stiffening plate (3), connecting rod (4), band adjustment tank chuck (5), auricle chuck (6) and adapter (7), band adjustment tank chuck (5) is four pieces, be separately fixed on the pillar (8) at testing machine two ends, two connecting rods (4) are connected on band adjustment tank chuck (5) perpendicular to the pillar (8) at testing machine two ends, prevent from the T-shaped beam of out-of-plane bending (2) having the groove (9) identical with connecting rod (4) thickness, connecting rod (4) embeds in the groove (9) prevented on the T-shaped beam of out-of-plane bending (2), two pieces of anti-buckling plates (1) are parallel to connecting rod (4) and are placed on band adjustment tank chuck (5), the xsect of anti-buckling plate (1) is U-shaped, the bottom surface of anti-buckling plate (1) has side by side the elongated slot (10) corresponding with stringer position on testpieces, the degree of depth of elongated slot is greater than the height of long purlin on testpieces, the relative clamp assay part (11) in bottom surface of two pieces of anti-buckling plates (1), the center of anti-buckling plate (1) has crackle observation port (12), two ends have bolt connecting hole (13), the two ends of stiffening plate (3) stride across crackle observation port by screw and are fixed on anti-buckling plate (1), the two ends of auricle chuck (6) clamp assay part are also fixed on testing machine by adapter (7).
2. according to claim 1ly a kind ofly to it is characterized in that for the device with stringer thin-walled part Crack Extension and residual intensity test, described anti-buckling plate (1) is clamped in testpieces middle part, chooses corresponding anti-buckling plate according to stringer type.
3. according to claim 1 a kind of for the device with stringer thin-walled part Crack Extension and residual intensity test, it is characterized in that: the surface of contact of described connecting rod (4) and band adjustment tank chuck (5) has adjustment tank, connecting rod (4) is upper mutually vertical with the upper adjustment tank (15) of adjustment tank (14) and band adjustment tank chuck (5).
4. according to claim 3 a kind of for the device with stringer thin-walled part Crack Extension and residual intensity test, it is characterized in that: the length direction along connecting rod (4) on described connecting rod (4) arranges adjustment tank, the adjustment tank on band adjustment tank chuck (5) is vertical with the adjustment tank on connecting rod (4).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310239499.7A CN103344480B (en) | 2013-06-17 | 2013-06-17 | Device for testing crack growth and residual strength of thin-wall plate with stringers |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310239499.7A CN103344480B (en) | 2013-06-17 | 2013-06-17 | Device for testing crack growth and residual strength of thin-wall plate with stringers |
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| CN103344480A CN103344480A (en) | 2013-10-09 |
| CN103344480B true CN103344480B (en) | 2015-06-03 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104697845B (en) * | 2013-12-06 | 2017-06-06 | 中国飞机强度研究所 | Fuselage wallboard static(al)/fatigue/damage tolerance test loading system |
| CN105334162A (en) * | 2015-11-26 | 2016-02-17 | 中国航空工业集团公司沈阳飞机设计研究所 | Aluminum-lithium alloy surface crack and residual intensity relation analysis method |
| CN105842050B (en) * | 2016-05-13 | 2017-12-08 | 中国航空工业集团公司北京航空材料研究院 | A kind of auxiliary mould for improving aluminium alloy sheet fracture toughness testing precision |
| CN105842049B (en) * | 2016-05-13 | 2020-05-22 | 中国航发北京航空材料研究院 | Detection method for improving test precision of fracture toughness of aluminum alloy sheet |
| CN109612836B (en) * | 2018-11-12 | 2021-09-17 | 南京航空航天大学 | Vertical compression test device suitable for big wallboard of buckling |
| CN112694008A (en) * | 2020-12-22 | 2021-04-23 | 中冶建筑研究总院有限公司 | Early warning method and device for fatigue failure of steel crane beam |
| CN112881160B (en) * | 2021-01-12 | 2023-01-17 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Clamp for fatigue test of metal wide plate |
| CN113109170B (en) * | 2021-04-20 | 2022-10-18 | 中国直升机设计研究所 | Composite material long beam strength test device |
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| KR20090066853A (en) * | 2007-12-20 | 2009-06-24 | 주식회사 포스코 | Apparatus for detecting fatigue cracks |
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| CN201574500U (en) * | 2009-09-30 | 2010-09-08 | 无锡济邦隔震技术有限公司 | Supporting type damper for preventing batten-shaped soft steel from bending |
| CN202013310U (en) * | 2010-11-15 | 2011-10-19 | 中国航空工业集团公司北京航空材料研究院 | Testing device used for realizing sheet pulling/pressing fatigue crack growth in corrosive environment |
| CN103015622A (en) * | 2012-12-20 | 2013-04-03 | 北京德力钢结构新技术有限公司 | Assembly composite shearing structural wall board |
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Patent Citations (5)
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| KR20090066853A (en) * | 2007-12-20 | 2009-06-24 | 주식회사 포스코 | Apparatus for detecting fatigue cracks |
| CN101561459A (en) * | 2009-06-04 | 2009-10-21 | 中国航空工业集团公司西安飞机设计研究所 | Damage-tolerance testing method for lower wall panel of airplane outboard wing |
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