1. Rationale
The primary purpose of this revision is to address an error in the current standard that was encountered by John Adelmann while consulting with a client regarding bearing testing. The error involves the shear factor K in the equation for bearing strain. In the definition of terms below equation (5) it states: K = 1.0 for double-shear tests (Procedures A and C), 2.0 for single-shear tests (Procedure B). This is correct in that K = 1 should be used for Procedures A and C (and also D) and that K = 2 should be used for Procedure B. However, this statement incorrectly identifies Procedure C as double-shear when, in fact, it is single-shear (as stated in the Scope section of the standard). As a result, this has been causing confusion during application of the standard. The definition of K can be corrected by removing the single- or double-shear designations. Single- or double-shear configurations do not determine the value of K. K is 1 for tests where it is assumed that all hole deformation is in one member of the assembly (the other member or members being a metal test fixture), and K is 2 for configurations where the total deformation is equally shared between members (both members are the same composite material with similar bearing stiffness).
Keywords
bearing properties; bearing strength; composite materials; Composite plastic materials/applications; Laminates; Bearing response; Polymers;
Citing ASTM Standards
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