Method for measuring static elasticity modulus of porous metal material

Abstract

The invention discloses a method for measuring static elasticity modulus of a porous metal material. The method comprises the following steps of: measuring the flexibility of a simply supported beam span in different loads by utilizing a simply supported beam four-point bending testing device and adopting static step-by-step loading; subsequently establishing a relationship curve between the flexibility in the span and the loads, and calculating according to a curve slope in equations so as to obtain a single time measurement value of the static elasticity modulus of the porous metal material; and measuring for multiple times within a linear elasticity range, and taking the average value so as to obtain the static elasticity modulus of the porous metal material. The method not only has the advantages of measurement result accuracy, good repeatability, high reliability, simple equipment, low testing cost, simpleness in sample preparation and the like, but also can realize repeated loading (unloading) and multiple measurements within the linear elasticity range; the method can be carried out on a conventional material mechanics pure bending testing table, no strain gages are necessary to be adhered, and only a dialgauge (micrometer gauge) is additionally arranged; and the method is simple and easy to operate and is applicable to popularization and application.

Description

technical field [0001] The invention relates to a method for measuring the static elastic modulus of a porous metal material, which belongs to the testing technology of material mechanical properties. Background technique [0002] Elastic modulus (elastic modulus), also known as Young's modulus, refers to the ratio of the normal stress to the corresponding normal strain of the material in the elastic deformation stage, expressed in E. The elastic modulus is an important performance parameter of various engineering materials. From a macroscopic point of view, the elastic modulus is a measure of the ability of an object to resist elastic deformation; A reflection of bond strength. The elastic modulus can be regarded as an index to measure the difficulty of elastic deformation of the material. The larger the value, the greater the stress that causes the material to undergo a certain elastic deformation. [0003] Porous metal foam is a new type of metal matrix composite materi...

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Problems solved by technology

The measurement results of the conventional static compression method are more accurate, but the required equipment is more expensive, and it has higher requirements for the preparation of porous metal samples

[0009] Although for the base metal, the elastic modulus can be measured by using the conventional four-point bending test device combined with the strain gauge method, but for the porous metal, the strain gauge is difficult to paste because of the rough surface of the material, and the bonded In the porous metal material of the strain gauge, the real adhesion between the strain gauge and the surface of the porous metal material is poor, so the synchronization and coordination of the elastic deformation of the two are naturally poor, so it is almost impossible to use the strain gauge method to measure the porous metal material. modulus of elasticity

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