Test piece for implementing biaxial tension-compression coupling stress state through uniaxial tension

Abstract

The invention belongs to the technical field of mechanical property measurement and particularly relates to a test piece which realizes bidirectional tension and compression coupling stress state by unidirectional stretching. The central part of a flat panel is bored with holes symmetrically to ensure that a decussation shape is formed at the central part. When pull is applied along unidirectional direction, the test piece bears the pull lengthways by self special shape and also applies the pressure to a central working area transversely, automatically and synchronously. The test piece is simple and convenient for using, does not require a complex matched clamp and can realize plane tension and compression coupling stress state just by the unidirectional stretching of the test piece by an existing unidirectional material testing machine directly; and a pressure field is applied synchronously and automatically by the self structure of the test piece without contacting with the outside of the test piece, thereby avoiding the disadvantage that the bidirectional stress state only can be realized by a double-shaft testing machine and also avoiding the problem of bidirectional synchronous concordant loading when using the double-shaft material testing machine.

Description

technical field [0001] The invention belongs to the technical field of mechanical performance measurement, and in particular relates to a test piece which realizes a bidirectional tension-compression coupled stress state through unidirectional tension. Background technique [0002] In traditional material mechanics tests, there are unidirectional tensile, unidirectional compression and bidirectional tensile tests, and the corresponding stress fields are unidirectional tensile, unidirectional compression and bidirectional tensile, respectively. Studying the response of materials under different stress states is of great significance for comprehensively understanding the properties of materials and guiding the teaching and scientific research of material mechanics. [0003] At present, to realize the state of bidirectional stress, it is usually necessary to use a biaxial material testing machine to load the specimen from two directions respectively, so as to obtain the state o...

AI Technical Summary

Problems solved by technology

However, the test equipment required by the biaxial material testing machine is relatively complicated, and the specimen is loaded from two directions at the same time, which makes synchronization and coordination difficult, increases the complexity of the experimental operation, and results in large errors.

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