The mean fatigue lives of [0=90]S E-glass fiber–epoxy laminates at maximum stress levels of 56,000 and 35,000 psi are 1,500 and 172,000, respectively. The static tensile strength of this material is 65,000 psi. Determine the residual static strength of this material after 50% of the fatigue life at each stress level 2. After cycling for 50% of the fatigue life at 35,000 psi, the maximum stress level in a fatigue specimen is increased to 56,000 psi. Estimate the number of cycles the specimen would survive at 56,000 psi 3. If the first stress level is 56,000 psi, which is then followed by 35,000 psi, estimate the number of cycles at the second stress level