Clamping fixture for heterogeneous test pieces

Abstract

The invention discloses a clamping fixture for heterogeneous test pieces. The clamping fixture is used for testing bonding strength of safety glass and a soft mounting carrier by a tensile testing machine, and comprises an upper clamping mechanism and a lower clamping mechanism. The upper clamping mechanism and the lower clamping mechanism are used for clamping the safety glass and the soft mounting carrier respectively. The clamping fixture has the advantages that the upper clamping mechanism and the lower clamping mechanism transfer tensile force from the exteriors of the test pieces, thrustsurfaces are large, and stress uniformity is achieved, so that the safety glass and the soft mounting carrier can be prevented from being damaged during clamping or pulling; a certain gap is reversedbetween a glass clamping plate and glass by the upper clamping mechanism through change of connection blocks with different thicknesses, and accordingly, influences on test results due to friction between the glass and the glass clamping plate are prevented; the lower clamping mechanism clamps the upper end face of the mounting carrier through an inner step, rhombus lines are arranged on a secondstep to increase frictional force between the second step and the mounting carrier, and accordingly, the lower clamping mechanism and the mounting carrier are prevented from damage.

Description

technical field [0001] The invention relates to a clamping tool, in particular to a heterogeneous material test piece clamping tool, which is used for a tensile testing machine to test the bonding strength of safety glass and a soft material mounting bracket. Background technique [0002] The car safety glass mounting bracket is a part of the glass connected to the body, which is used to realize the installation of the safety glass on the glass lifting track through the bracket, so as to achieve the purpose of smooth lifting of the glass. Automotive safety glass mounting brackets are molded with inserts. First, the primer is coated on the surface of the safety glass, and the safety glass is used as the insert, and soft TPE / SPVC is used as the injection molding material for injection molding. The bonding strength between the safety glass and the mounting bracket affects the installation and use of the glass, so a tensile test is required to test the bonding strength between...

AI Technical Summary

Problems solved by technology

The bonding strength between the safety glass and the mounting bracket affects the installation and use of the glass, so a tensile test is required to test the bonding strength between the two, but the automotive safety glass and the mounting bracket are heterogeneous materials , that is, the safety glass is a brittle material, and the mounting bracket is a soft material. The existing tensile testing machine has the following problems in testing the bonding strength between the safety glass and the mounting bracket: 1) The existing tensile fixture is easy to clamp 2) Since TPE / SPVC is a soft material, when its own strength is lower than the bond strength, the first thing to break in the tensile test is the TPE / SPVC itself, which cannot be Test the bonding strength; 3) Due to the good ductility of the soft material TPE / SPVC, it participates in deformation during the stretching process, which affects the accuracy of the bonding strength test

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