Abstract
The proposed new technique of fatigue life prediction for notched composite plates is based on a residual strength model calibrated with the use of step-wise fatigue tests. It was proposed to calibrate the fatigue model with fatigue tests in which load conditions are in a step-wise fashion. The adopted fatigue model takes into account the most important loading parameters such as testing frequency, stress ratio, layer orientation and maximal fatigue stress. It was demonstrated that with the use of step-wise fatigue tests, it is possible to calibrate the fatigue model for a particular material and structure with the use of fewer samples. In the experimental tensile and fatigue tests TVR 380 M12/26%/R-glass/epoxy composite plates [+45°/−45°]4 with circular and elliptical cut-outs were used. The fatigue tests were performed under different loading conditions. The influence of testing frequency, stress ratio, maximal fatigue load and also geometry of the cut-out on damage growth rate and fatigue life were studied. The predicted fatigue life was in good agreement with the durability determined experimentally in all investigated samples.
Highlights
Multilayered fibre-reinforced composite materials are extensively used in various engineering applications including critical structural components
The aim of the present paper is to propose a method for quick determining of fatigue life of multilayered composite plates with notches which experimental fatiguelife tests
Fatigue lives for the investigated plates with circular and elliptical cut-outs were predicted and given in Table 4 using the residual strength model (6) with the material parameters α = 0.123351 and β = 0.244873 established in Section 4 from the step-wise fatigue tests
Summary
Multilayered fibre-reinforced composite materials are extensively used in various engineering applications including critical structural components. Similar major categories of fatigue models are often proposed for multi-layered composite structures: The phenomenological criteria for the residual strength or stiffness, the progressive damage criteria and the fatigue life models based on the Goodman-type or S–N curves [44]. Such models contain different parameters of and Materials. The proposed procedure is based on the observation of the fatigue multilayered fibre-reinforced composite plates with notches for which experimental fatigue tests have behaviour glass/epoxy different loading conditions with the not yet beenofperformed.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
