Fatigue Fracture Behaviors of Transparent Polycarbonate Materials

被引：0
|
作者：
Zhang X.-W. [1 ]
Wu N. [1 ]
Zhang X. [1 ]
Ma L.-T. [1 ]
Li L. [1 ]
机构：
[1] AECC Beijing Institute of Aeronautical Materials, Beijing
来源：
Li, Lei (lei.li@biam.ac.cn) | 2017年 / Beijing Institute of Aeronautical Materials (BIAM)卷 / 45期
关键词：
Annealing; Fatigue fracture; Fracture morphology; Polycarbonate; Stress ratio;
D O I：
10.11868/j.issn.1001-4381.2016.001188
中图分类号：
学科分类号：
摘要：
The effect of the different stress ratios (R) and annealing treatment on the fatigue properties of the transparent polycarbonate (PC) sheet and the mechanism behind were studied, the fatigue crack propagation (FCP) process and mechanism were analyzed. The results show that after annealing, the residual stress of the PC samples decreases obviously and the fatigue properties are greatly improved. This is because the machining process results in tensile stress in the PC samples, eliminating the tensile stress can improve the fatigue property of PC effectively; under the positive stress ratio (tensile-tensile fatigue), as the stress amplitude increases, the fatigue properties of PC decreases obviously, however, the negative stress ratio (tensile-compression fatigue) causes complex influence on the fatigue properties of PC. The fatigue fracture morphology suggests that distinct crack source, stable crack extension zone and instability zone exist obviously in fatigue fracture of PC. The mechanism of the fatigue crack propagation of PC indicates that crazes are initiated at first under the cycling stress, when the stress is higher than the strength of the fibrils in crazes or the fibrils are broken under the cycling stress, crazes develop into cracks. © 2017, Journal of Materials Engineering. All right reserved.
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页码：30 / 35
页数：5
相关论文
共 16 条
  • [1] Yang W., Liu Z.Y., Yang M.B., The Technology and Application of the PC Alloys, (2008)
  • [2] Yan C.G., Han J., Zhang J.L., Et al., Effect of surface silicone coating on environmental stress cracking resistance of transparent polycarbonate parts, Journal of Aeronautical Materials, 36, 5, pp. 52-57, (2016)
  • [3] Zhang X., Zhong Y.L., Yan Y., Et al., Nanomechanical and nanotribological properties of scratch-resistant coatings on polycarbonate, Journal of Materials Engineering, 1, pp. 79-84, (2014)
  • [4] Ge Y., Wang T., Li L., Effect of injection molding parameters on residual stress of polycarbonate, Journal of Materials Engineering, 1, pp. 24-29, (2014)
  • [5] Kim G.H., Lu H.B., Accelerated fatigue life testing of polycarbonate at low frequency under isothermal condition, Polymer Testing, 27, pp. 114-121, (2008)
  • [6] Bauwens-Crowet C., Bauwens J.C., Annealing of polycarbonate below the glass transition: quantitative interpretation of the effect on yield stress and differential scanning calorimetry measurements, Polymer, 23, 11, pp. 1599-1604, (1982)
  • [7] Fang Q.Z., Wang T.J., Li H.M., Overload-induced retardation of fatigue crack growth in polycarbonate, International Journal of Fatigue, 30, pp. 1419-1429, (2008)
  • [8] Fang Q.Z., Wang T.J., Li H.M., Overload effect on the fatigue crack propagation of PC/ABS alloy, Polymer, 48, pp. 6691-6706, (2007)
  • [9] Xu W.L., Research on residual stress and optical performance of transparent injection molded parts, (2006)
  • [10] Weng C., Lee W.B., To S., Birefringence techniques for the characterization of residual stresses in injection-moulded micro-lens arrays, Polymer Testing, 28, pp. 709-714, (2009)
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