CN113049361A - Laminated board III type crack delamination failure test method and test piece - Google Patents
Laminated board III type crack delamination failure test method and test piece Download PDFInfo
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- CN113049361A CN113049361A CN201911387632.7A CN201911387632A CN113049361A CN 113049361 A CN113049361 A CN 113049361A CN 201911387632 A CN201911387632 A CN 201911387632A CN 113049361 A CN113049361 A CN 113049361A
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- 238000012360 testing method Methods 0.000 title claims abstract description 62
- 230000032798 delamination Effects 0.000 title claims description 16
- 238000010998 test method Methods 0.000 title claims description 13
- 239000002184 metal Substances 0.000 claims abstract description 31
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 30
- 230000006378 damage Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 description 5
- 239000011229 interlayer Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007656 fracture toughness test Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A test piece comprises a laminated board and metal reinforcing plates, the laminated board comprises prefabricated cracks, the two sides of the laminated board are respectively bonded with the metal reinforcing plates with the same size, a test fixture comprises two Z-shaped clamping plates and a torsion limiting table, the two Z-shaped clamping plates are used for connecting the front end of the test piece, the torsion limiting table is used for limiting the rear end of the test piece, and a chuck of the test machine applies tensile load to the front end of the test piece through the Z-shaped clamping plates to perform a laminated board III-type crack layered failure test.
Description
Technical Field
The invention belongs to a test method for interlayer fracture toughness of a composite material, and particularly relates to a test method for III-type fracture delamination failure of a laminated board and a test piece.
Background
The delamination failure of the composite material has the characteristic of self-similarity expansion along the interlayer, and can be predicted and analyzed by using a fracture mechanics theory; the test of the layered fracture toughness and the characteristic research of the composite material are very important and are basic data of the applied layered fracture mechanical analysis. At present, the research on III type layered fracture toughness has fewer reports due to higher difficulty of test technology, and the adopted test methods have great limitations and disadvantages. The test method and the layering characteristic of the III-type layering fracture toughness test have both theoretical value and important application value.
Disclosure of Invention
The invention aims to provide a lamination plate III type crack delamination failure test method.
A laminated board III type crack delamination failure test method is characterized by comprising the following contents: 1) a laminate having a pre-crack, the laminate being rectangular, said pre-crack being located on a central plane of a front end of the laminate; 2) respectively bonding two equal-size metal reinforcing plates on two sides of the laminated plate, and respectively arranging symmetrical threaded holes at the front ends of the metal reinforcing plates on the two sides to form a test piece for the layered damage of the III-type cracks of the laminated plate; 3) the lower end of the upper clamping plate is connected with the metal reinforcing plate on the left side of the test piece through a bolt, the upper end of the upper clamping plate is connected with an upper chuck of the testing machine, the upper end of the lower clamping plate is connected with the metal reinforcing plate on the right side of the test piece through a bolt, and the lower end of the lower clamping plate is connected with a lower chuck of the testing machine; 4) the torque limiting platform comprises a base and two torque limiting columns perpendicular to the base; the rear end of the test piece is clamped between the two torque limiting columns; 5) the laminate type iii crack delamination failure test was performed by applying a tensile load to the front end of the test piece through the upper and lower chucks of the testing machine.
The application still provides a III type crackle layering of laminate destruction test pieces, its characterized in that, this test piece contains laminate and metal reinforcing plate, the laminate be a laminate that contains the prefabricated crack, this laminate is a rectangle, the prefabricated crack be located the central plane of laminate front end, metal reinforcing plate have two, and with laminate equidimension, be equipped with symmetrical screw hole respectively near the front end of two metal reinforcing plates, two metal reinforcing plates bond respectively in the both sides of laminate.
The beneficial effect of this application lies in: 1) a test piece structure, a test fixture and a test method for interlayer delamination failure of III-type fracture toughness of a composite material laminated board are provided. 2) The metal reinforcing plates on two sides of the test piece and the laminated plate with the prefabricated cracks are integrally formed, the torsional rigidity of the metal reinforcing plates and the torsion limiting columns are utilized to eliminate the influence of the torsional effect of the test piece, the metal reinforcing plates are connected with the upper clamping plate and the lower clamping plate through bolts, the bolts only penetrate into the metal reinforcing plates on two sides and are not connected with the laminated plate, and the defects that the traditional method for bonding the test piece and the clamp with the reinforcing sheet is poor in reliability, large in workload and incapable of being implemented due to the fact that the bonding strength is difficult to guarantee for a composite material with a high-toughness or low-activity surface are solved.
The present application is described in further detail below with reference to the accompanying drawings of embodiments.
Drawings
FIG. 1 is a schematic representation of the laminate type III crack delamination failure test method of the present application.
The numbering in the figures illustrates: the testing machine comprises a testing machine upper chuck 1, a connecting piece 2, an upper clamping plate 3, a lower clamping plate 4, bolts 5, a laminated plate 6, a metal reinforcing plate 7, a torque limiting column 8 and a base 9.
Detailed Description
Referring to the drawings, the test piece in the test is of an integral structure and comprises a laminated plate 7 and metal reinforcing plates 7, the laminated plate 6 is a laminated plate containing prefabricated cracks (not shown in the drawings), the laminated plate 6 is rectangular, the prefabricated cracks are located on the central surface of the front end of the laminated plate, the metal reinforcing plates 7 are two and have the same size with the laminated plate, symmetrical threaded holes are respectively formed in the positions, close to the front ends, of the two metal reinforcing plates 7, the two metal reinforcing plates 7 are respectively bonded to two sides of the laminated plate 6, and the test piece for the laminated plate III type crack delamination breakage is formed.
The test piece is clamped during the III-type crack layered failure test, the clamping fixture comprises two Z-shaped clamping plates and a torsion limiting table, the two Z-shaped clamping plates are used for connecting the front end of the test piece, and the torsion limiting table is used for limiting the rear end of the test piece. The two Z-shaped clamping plates comprise an upper clamping plate 3 and a lower clamping plate 4, the lower end of the upper clamping plate 3 is connected with a metal reinforcing plate 7 on the left side of the test piece through a bolt 5, the upper end of the upper clamping plate 3 is connected with an upper chuck 1 of the testing machine, the upper end of the lower clamping plate 4 is connected with a metal reinforcing plate 7 on the right side of the test piece through a bolt 5, and the lower end of the lower clamping plate 4 is connected with a lower chuck (not shown in the figure) of the testing machine; the torsion limiting table comprises a base 9 and two torsion limiting columns 8 perpendicular to the base; the rear end of the test piece is clamped between the two torque limiting columns 8; the laminate type iii crack delamination failure test was performed by applying a tensile load to the tip of the test piece through the upper and lower chucks 1 and 1 of the testing machine.
It is emphasized that when a tensile load is applied to the front end of the test piece by the upper jaw 1 and the lower jaw of the testing machine, the line of force of the tensile load passes through the pre-cracks of the laminate.
In order to ensure that the lines of force of the tensile load pass through the pre-cracks of the laminate, the gap between the upper and lower clamping plates 3, 4 and the metal reinforcing plate 7 can be adjusted by the bolts 5 to change the relative positions of the pre-cracks of the laminate 6 and the lines of force of the tensile load.
In the implementation, it is further noted that the distance between the two torque limiting columns 8 on the torque limiting table is preferably adjustable, and the inner sides of the two torque limiting columns 8 are respectively contacted with the outer surfaces of the reinforcing sheets 7 on the two sides of the test piece by adjusting the distance between the torque limiting columns 8, so that the torque limiting columns 8 cannot limit the deformation of the test piece in the loading direction.
Claims (5)
1. A laminated board III type crack delamination failure test method is characterized by comprising the following contents: 1) a laminate having a pre-crack, the laminate being rectangular, said pre-crack being located on a central plane of a front end of the laminate; 2) respectively bonding two equal-size metal reinforcing plates on two sides of the laminated plate, and respectively arranging symmetrical threaded holes at the front ends of the metal reinforcing plates on the two sides to form a test piece for the layered damage of the III-type cracks of the laminated plate; 3) the lower end of the upper clamping plate is connected with the metal reinforcing plate on the left side of the test piece through a bolt, the upper end of the upper clamping plate is connected with an upper chuck of the testing machine, the upper end of the lower clamping plate is connected with the metal reinforcing plate on the right side of the test piece through a bolt, and the lower end of the lower clamping plate is connected with a lower chuck of the testing machine; 4) the torque limiting platform comprises a base and two torque limiting columns perpendicular to the base; the rear end of the test piece is clamped between the two torque limiting columns; 5) the laminate type iii crack delamination failure test was performed by applying a tensile load to the front end of the test piece through the upper and lower chucks of the testing machine.
2. The laminate type iii crack delamination failure test method of claim 1, wherein in step 5), the tensile load line passes through a pre-crack of the laminate.
3. The method of the laminate type iii crack delamination failure test of claim 1 wherein the relative position of the pre-crack and the tensile load line of the laminate is changed by adjusting the gap between the upper and lower clamping plates and the metal reinforcing plate with bolts.
4. The laminated board III-type crack layered failure test method of claim 1, wherein the distance between two torque limiting columns on the torque limiting table is adjustable, the inner sides of the two torque limiting columns are respectively contacted with the outer surfaces of reinforcing sheets on two sides of a test piece by adjusting the distance between the torque limiting columns, and the torque limiting columns do not limit the deformation of the test piece in the loading direction.
5. A laminated plate III type crack delamination failure test piece is characterized by comprising a laminated plate and two metal reinforced plates, wherein the laminated plate is a laminated plate with a prefabricated crack, the laminated plate is rectangular, the prefabricated crack is positioned on the central surface of the front end of the laminated plate, the two metal reinforced plates have the same size with the laminated plate, symmetrical threaded holes are respectively formed in the front ends of the two metal reinforced plates, and the two metal reinforced plates are respectively adhered to two sides of the laminated plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911387632.7A CN113049361A (en) | 2019-12-27 | 2019-12-27 | Laminated board III type crack delamination failure test method and test piece |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911387632.7A CN113049361A (en) | 2019-12-27 | 2019-12-27 | Laminated board III type crack delamination failure test method and test piece |
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| CN113049361A true CN113049361A (en) | 2021-06-29 |
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| CN201911387632.7A Pending CN113049361A (en) | 2019-12-27 | 2019-12-27 | Laminated board III type crack delamination failure test method and test piece |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103605865A (en) * | 2013-11-28 | 2014-02-26 | 北京航空航天大学 | Delamination propagation behavior simulation method of composite material multidirectional laminated plate on basis of cohesion model |
| CN206671063U (en) * | 2017-03-31 | 2017-11-24 | 浙江亚厦装饰股份有限公司 | A kind of composite continuous damage performance test fixture |
| CN107621408A (en) * | 2017-08-29 | 2018-01-23 | 南京航空航天大学 | A kind of Fiber Reinforced Metal Laminates I mode Ⅱ fracture toughness GICEvaluation test method and device |
| CN108333047A (en) * | 2018-02-07 | 2018-07-27 | 西北工业大学 | A kind of the dynamic symmetry stretching device and its experimental method of I types precracked specimen |
| CN110175396A (en) * | 2019-05-24 | 2019-08-27 | 吉林大学 | A kind of bonded structure Analysis of Fracture Failure method based on unified stress criterion |
| CN209513430U (en) * | 2018-12-14 | 2019-10-18 | 中国航空工业集团公司西安飞机设计研究所 | A kind of III type interlaminar delamination failure test part of composite material laminated board |
-
2019
- 2019-12-27 CN CN201911387632.7A patent/CN113049361A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103605865A (en) * | 2013-11-28 | 2014-02-26 | 北京航空航天大学 | Delamination propagation behavior simulation method of composite material multidirectional laminated plate on basis of cohesion model |
| CN206671063U (en) * | 2017-03-31 | 2017-11-24 | 浙江亚厦装饰股份有限公司 | A kind of composite continuous damage performance test fixture |
| CN107621408A (en) * | 2017-08-29 | 2018-01-23 | 南京航空航天大学 | A kind of Fiber Reinforced Metal Laminates I mode Ⅱ fracture toughness GICEvaluation test method and device |
| CN108333047A (en) * | 2018-02-07 | 2018-07-27 | 西北工业大学 | A kind of the dynamic symmetry stretching device and its experimental method of I types precracked specimen |
| CN209513430U (en) * | 2018-12-14 | 2019-10-18 | 中国航空工业集团公司西安飞机设计研究所 | A kind of III type interlaminar delamination failure test part of composite material laminated board |
| CN110175396A (en) * | 2019-05-24 | 2019-08-27 | 吉林大学 | A kind of bonded structure Analysis of Fracture Failure method based on unified stress criterion |
Non-Patent Citations (2)
| Title |
|---|
| 杨宇;柴亚南;迟坚;陈向明;林国伟;: "铺层方向和裂纹混合比对复合材料层压板混合型断裂韧性影响的试验研究", 复合材料学报 * |
| 陈智;曾建江;童明波;: "张力场对复合材料层板组合梁连接强度的影响", 南京航空航天大学学报 * |
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