Material constitutive test method under complex stress condition

Abstract

The invention belongs to the material processing technology field and relates to a material constitutive and mechanical property test method under a complex stress condition. A material constitutive and a mechanical property under the complex stress condition are accurately tested so as to further study a material property and an application value, and a material processing technology is simulatedand a theoretical guidance is provided for an actual production process. A realization method mainly comprises the following steps of designing a a triaxial hydraulic device; preparing a test material; installing and fixing the material on a test platform, and then preheating the material; carrying out all-dimensional loading and providing a complex stress state; recording data; and analyzing andprocessing the data and acquiring a constitutive curve. By using the material constitutive test method under a complex stress state, through adding hydraulic cylinders on the other two axes based onan original uniaxial tensile test machine, the complex stress condition of a sample is directly provided and test efficiency and accuracy are increased.

Description

technical field [0001] The invention relates to a stress-strain test experimental device, which is a test method aimed at the constitutive relationship of materials under complex stress conditions. Background technique [0002] The constitutive relationship of materials refers to the stress-strain relationship of materials, which is an important factor to characterize the mechanical properties of materials and plays a decisive role in the simulation process of material processing. Whether the determination of material constitutive relationship is accurate or not not only affects the evaluation of material properties, but also directly affects the accuracy of material processing simulation, thus determining the application and development of a material. The constitutive relationship of materials is generally measured by a universal testing machine, that is, the sample is clamped between the upper and lower chucks of the universal testing machine, tension or pressure is applie...

AI Technical Summary

Problems solved by technology

The constitutive relationship of materials is generally measured by a universal testing machine, that is, the sample is clamped between the upper and lower chucks of the universal testing machine, tension or pressure is applied to the material through the chucks, and the strain gauges attached to the surface of the sample are measured. Strain, a stress-strain curve is finally obtained through calculation and processing, and the determination of material constitutive under complex stress conditions is replaced by equivalent stress or equivalent strain, and in actual engineering applications, the actual service of the material The environment is often complex, often under the action of multiaxial stress, and the actual mechanical properties are also affected by factors such as temperature, so the traditional uniaxial tensile test cannot fully reflect the mechanical properties of materials under complex stress conditions, and cannot establish accurate Constitutive relationship; although the cross tensile test method can intuitively reflect the bidirectional stress state of the material, it cannot accurately predict the constitutive relationship of molding defects and materials for some complex parts or materials in a specific temperature environment

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