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Method for determining plane stress fracture toughness and yield strength of aluminum alloy material by structure yield load

An aluminum alloy material and fracture toughness technology, which is applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problem that the fracture toughness test method is not given, the production cost of test specimens and the test workload are increased and aggravated. The difficulty of test operation and other problems have achieved the effect of loose test conditions, easy operation and implementation, and easy promotion and implementation.

Active Publication Date: 2016-10-12
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology

[0004] In addition, what makes the test operation more difficult is that the fatigue test is required to form the initial crack of the specimen, and in the metal fracture toughness test, there are strict restrictions on the specimen type, loading fixture, loading method, and test system. The necessary participation of the fatigue testing machine greatly increases the production cost and test workload of the test specimen
[0005] It should also be noted that the current domestic and foreign test specifications can only determine the plane strain fracture toughness K of metal materials. IC , while the metal fracture toughness K under plane stress C The fracture toughness test method has not been given

Method used

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  • Method for determining plane stress fracture toughness and yield strength of aluminum alloy material by structure yield load
  • Method for determining plane stress fracture toughness and yield strength of aluminum alloy material by structure yield load
  • Method for determining plane stress fracture toughness and yield strength of aluminum alloy material by structure yield load

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Embodiment 1

[0047] Example 1: 6061 aluminum alloy materials are used to process and manufacture seven groups of test pieces. The size of the test piece is: W=40mm, B=6.1mm, L=60mm, the height of the arc section of the test piece is 20mm, and the size of the rectangular clamping end is: 70mm×80mm. The wire cutting process was used to cut the initial cracks for each test piece respectively. The width of the initial cracks was less than 0.20mm.

[0048] On the tensile testing machine, load at a constant speed until the specimen breaks according to the rate specified in the "Metallic Materials Tensile Test Part 1: Room Temperature Test Method" (GB / T 228.1-2010) specification. Record the external load-displacement full curve of each cracked specimen during the test, see figure 2 . The material properties (fracture toughness and yield strength) of the aluminum alloy material are determined by the structural properties of the specimen (measured yield load), that is, the structural yield load ...

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Abstract

The invention relates to a method for determining plane stress fracture toughness and yield strength of an aluminum alloy material by structure yield load. The method comprises the following steps: machining the aluminum alloy material to manufacture a test piece, cutting out a crack, loading the test piece according to a metal material tensile test method, determining the structure yield load of the test piece based on an outer load-displacement complete curve which is actually tested by a test, calculating equivalent crack length, and finally, carrying out regression analysis on testing data to obtain the fracture toughness KC and the yield strength sigmaY of the aluminum alloy material under a plane stress condition. Only a tensile test of a small-size unidirectional plate with the crack is needed and an initial crack machining method is simple and convenient; strict regulations on sizes, forms, loading conditions and the like of tested test samples by current specifications at home and abroad do not need to be met, so that the test strength and the test cost are reduced.

Description

technical field [0001] The invention relates to the technical field of metal material performance detection, in particular to a method for determining the plane stress fracture toughness and yield strength of an aluminum alloy material from a structural yield load. Background technique [0002] At present, in order to test the yield strength and tensile strength of metal materials, it is necessary to process the test piece into a certain type, and to plan the surface and other treatment measures. The purpose is to remove certain microscopic imperfections that they indicate to exist. However, if the unprocessed and surface-treated metal material specimens are tested directly, the actual material properties will be reduced due to the existence of defects, and the measured yield strength and tensile strength are lower than the real situation. For example, it is found through tests: (1) The actual yield strength and tensile strength of Q235B steel are 330MPa and 450MPa respecti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08
Inventor 管俊峰白卫峰姚贤华胡晓智王娟谢超鹏王强钱国双韩霄羽
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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