A simple plane bending fatigue and corrosion fatigue testing machine

Abstract

The design of a new and simple displacement-controlled high-cycle fatigue and corrosion fatigue machine is discussed. The new design allows the simultaneous testing of more than one test specimen. Stress amplitudes and mean stresses can be selected individually; the frequency however is the same for each test specimen.

Fatigue behaviour of laser sintered Nylon 12 in rotating and reversed bending tests

“…A reversed bending fatigue jig was designed according to similar previous applications, 15,16 which converted rotational motion into a linear displacement with variable length according to the eccentric wheel (Fig. 4).…”

Flexural fatigue behaviour of carbon nanofiber/epoxy nanocomposites

“…The curve of the neutral plane in a bent beam is described by the differential equation of the deflection curve. Finally by integrating the following equation, the maximum stress in the critical cross section is obtained as follows: where Z 0 is the displacement at point x = L 0 and E is the Young's modulus. The relation between the displacement Z 0 at the tip and the maximum stress σ max for small deformation is linear.…”

“…The curve of the neutral plane in a bent beam is described by the differential equation of the deflection curve. Finally by integrating the following equation, the maximum stress in the critical cross section is obtained as follows 12 :…”

Displacement-controlled flexural bending fatigue behavior of graphene/epoxy nanocomposites

“…where H is the thickness of the beam. Finally, the maximum tension or compression stress at a given cross-section for small displacements within elastic deformation behavior is calculated according to the following equation 17 :…”