Biaxial fixture is the devices that locate at universal tensile machine to study the materials strength properties. In this project, a fixture for the biaxial loading testing is design and analyze for using at the Universal testing Machine. The basic biaxial test can be used to measure basic material properties of the behavior with specific features of interest under biaxial loading conditions. The biaxial load-ing fixture must be in the suitable size that can be apply on the machine and can be expend into var-iable size according to the specimen that want to be tested. Firstly, stress analysis and exact as pos-sible must be carried out. Without reliable stresses acting on a body, it is impossible to continue fur-ther analysis. An experimental method for precisely measuring the stress-strain distribution and pre-dicting the material behavior under certain specialized service conditions has been developed using inplane biaxial testing. The requirement for an ideal biaxial testing is that the stress and strain distri-bution in the gage area of the specimen therefore to fulfill this requirement, the fixture must always obey all the mechanical strength rule and properties. The results of testing such are important for the characterization of the material properties and the development of constitutive laws that can be used for predictive purposes. Therefore it clarifies the extent. Finally the analysis of biaxial fixture to which biaxial testing can be used for determining the elastic properties of these materials. Moreover, it is shown that certain assumptions underlying the analysis of planar biaxial tests are inconsistent with the classical linear theory
