kaksoislevyleikkaustestiä

The kaksoislevyleikkaustestiä, or double shear test, is a mechanical test used to determine the shear strength of a material. It involves applying a tensile load to a specimen that is supported in such a way that it is subjected to shear stress in two distinct planes simultaneously. This arrangement ensures that the shear failure occurs within the material itself, rather than at the points of gripping or support.

The test specimen typically consists of a rectangular or cylindrical rod with a reduced cross-section in the middle. This central section is designed to be the weakest point, where the double shear stress will concentrate. Pins or bolts are often used to hold the specimen in place and to apply the load. As the tensile force is increased, the specimen eventually fails by shearing in the two designated planes.

The primary purpose of the double shear test is to measure the ultimate shear strength of the material. This value is calculated by dividing the maximum load applied before failure by the total area that has been sheared. The total sheared area is twice the cross-sectional area of the reduced section of the specimen, hence the name "double shear." This test is particularly useful for evaluating the shear performance of fasteners, welds, and ductile materials. Its simplicity and direct measurement of shear strength make it a common method in materials science and engineering for quality control and material characterization.