Determination of compressive strength of unidirectional composites by three-point bending tests

The effects of unequal compressive/tensile moduli of composites

“…The ratio of maximum compressive stress on the top surface to maximum tensile stress on the bottom surface is given by: Equations (15)(16) indicate that the maximum compressive strain (top surface) is higher than tensile strain (bottom surface), but the maximum tensile stress is higher than maximum compressive stress. The higher compressive strain may lead to microbuckling and compressive failure, particular in thick laminates.…”

“…Zhou and Davies [13,14] used statistical methods and assumed a higher compressive modulus to characterize the failure mechanics of thick glass woven roving/polyester laminates. Mujika et al [15,16] used strain gauges to determine the compressive and tensile moduli of unidirectional laminates by measuring the compressive strain and tensile strain at the top and bottom surfaces of specimens in three-point and four-point bending. However, the effects of unequal moduli on the flexural properties and the failure strength of multidirectional filament laminate composites have not been well understood.…”

A new method for evaluation of mechanical properties of glass/epoxy composites at low temperatures

“…Carbajal and Mujika [8] have determined the compressive strength of unidirectional composites by three-point bending tests. Unidirectional carbon/ epoxy composites T6T/F593 from Hexcel Composites are tested by three-point bending with different thicknesses and spans.…”

Influence of punch radius on elastic modulus of three-point bending tests

“…[1][2][3][4] TPB is often applied to determination of brittleness of low-plasticity materials, such as cast iron, high carbon steel, and ceramics. In the application, the bending strength 5,6 and deflection 7 are obtained during the bending. In addition, TPB is also used to check the quality of the surface of sandwich materials.…”