Development of a Specimen for In-Situ Diffraction Planar Biaxial Experiments

Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)


In this paper, the design of cruciform shaped, planar biaxial loading specimens using finite element analysis, mechanical testing, and digital image correlation is discussed. The specimens were designed to be capable of arbitrary combinations of tension and compression loading. Digital image correlation results from uniaxial tension tests of first-generation specimen infer key design attributes of second-generation specimen. Finite element results are compared with a plane stress analytical formulation and differences between the two are attributed to stress concentration fields originating at the intersection of specimen arms. These results motivate a parametric finite element geometry optimization of second-generation specimen.


SEM DIC FEA Planar biaxial Compression 



Young’s modulus


Strain in the 11 direction


Strain in the 22 direction


Ratio of 11–22 direction applied surface tractions


Analytical formulation ratio of 11–22 direction gage stresses


FEA simulation ratio of 11–22 direction gage stresses


Poisson’s ratio


Stress in the 11 direction


Applied surface traction in the 11 direction


Analytical formulation gage stress in the 11 direction


FEA simulation gage stress in the 11 direction


Stress in the 22 direction


Applied surface traction in the 22 direction


Analytical formulation gage stress in the 22 direction


FEA simulation gage stress in the 22 direction


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Copyright information

© The Society for Experimental Mechanics, Inc. 2016

Authors and Affiliations

  1. 1.Mechanical Engineering DepartmentColorado School of MinesGoldenUSA

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