The effects of loading frequency, tensile overload and compressive underload on the fatigue crack propagation behaviour of polymethyl methacrylate

Overload effect on the fatigue crack propagation of PC/ABS alloy

“…They are generally more than 50,000 depending on the value of overload ratio P peak /P max for PC/ABS alloy. Reference to literature [27,28]: P peak /P max value of 1.18 is used in the experiment given in Ref. [27], which gives a retardation of about 60 cycles.…”

“…P peak /P max values of 1.7 and 1.95 are used in the experiment in Ref. [28], which gives overload retardation cycles of about 1000 cycles. To obtain an obvious effect of overload ratio on FCP retardation, two overload ratios of 2.5 and 3 are used in the investigation.…”

“…Imai et al [27] experimentally studied the retardation of fatigue crack growth due to overload in polymethylmethacrylate (PMMA) by measuring the optical interference fringes from the crack and craze during the fatigue loading with a very low cyclic fatigue frequency, and concluded that the reduction of the stress at the crack tip after removing the overload was one of the main reasons that caused the retardation of crack growth. Yuen et al [28] studied the effects of loading frequency, tensile overload and compressive underload on the fatigue crack propagation of PMMA. It was shown that the crack propagation accelerated when the overload was applied, and retardation occurred when the overload was removed.…”

Mode II fatigue delamination growth characterization of a carbon/epoxy laminate at high frequency under vibration loading

“…Yuen et al [25] reported no effect of frequency at room temperature for the PMMA. Merah et al [26] achieved tests on Chlorinated PolyVinyl Chloride (CPVC) to find the influence of temperature and frequency between 0.1 Hz and 10 Hz.…”

“…Frequency effects on fatigue crack propagation in polymers are largely dependent upon the polymer itself [13,[24][25][26]. Yuen et al [25] reported no effect of frequency at room temperature for the PMMA.…”