Experimental observation on multiaxial ratchetting of polycarbonate polymer at room temperature

Experimental Observation on the Pure Torsional Ratchetting of Polycarbonate Polymer at Room Temperature

“…e material used in this experimental study is consistent with that of our previous article [4]. e raw material is an extruded PC polymer bar from BAYER Makrolon ® .…”

“…erefore, in this paper, a systematic experimental study on the pure torsional cyclic deformation of polycarbonate polymer is carried out, and the torsional ratchetting and cyclic softening/hardening of the material under pure torsional cyclic loading were discussed. ese experimental results, as a supplement to the results of our previous papers [4,5], will provide a basis for the establishment of the constitutive model of the material and facilitate the application of the material in engineering.…”

“…Polycarbonate (PC) polymer is widely used in various engineering structures, such as pressure vessels, automotive components, aerospace structures, military equipment, and civil engineering due to its excellent mechanical properties [1][2][3][4][5]. ese engineering structures are usually subjected to a cyclic loading, with ratchetting (produced in the case of asymmetric stress-controlled cyclic deformation) and fatigue failure as the main failure modes.…”

“…e results demonstrate that the yield and fracture stress of PC/ABS are lower than those of PC, while the reduction of fracture stress and strain caused by cyclic loading of PC is greater than that of PC/ABS; Chen et al [14][15][16] systematically studied the deformation behavior of ultrahigh molecular weight polyethylene under stress-controlled cyclic loading and discussed the ratchetting behavior under uniaxial and nonproportional multiaxial loading, respectively. Based on the experimental results, a cyclic constitutive model considering the nonproportional multiaxis effect was proposed; Yang et al [17,18] conducted a series of stress-controlled cyclic loading experiments on polyamide-6 material, discussed the ratchetting-fatigue interaction of the material, and found that ratchetting strain has a harmful effect on the fatigue life of the material; Tong et al [19] conducted uniaxial stress and strain-controlled cyclic loading tests on solid propellant polymer composites and discussed the influence of thermal generation on the material properties; our previous papers [4,5] studied the uniaxial and multiaxial ratchetting of polycarbonate polymer and discussed the influence of temperature on the uniaxial ratchetting and the effect of loading path on the multiaxial ratchetting of the material. From the existing literatures, it can be concluded that the ratchetting of polymers is greatly affected by temperature, humidity, loading rate, loading path, average stress, stress amplitude, and other factors due to the significant viscoelasticity of the materials.…”

Finite Element Analysis of Biaxial Cyclic Tensile Loading of Elasto-Plastic Plate With Central Elliptical Hole

“…Поскольку проблемы определения асимптотического состояния неупругих тел в последнее время вызывают значительный интерес, в литературе предлагаются решения множества прикладных задач прочности при циклической нагрузке различных конструкций: рельсов, инструментов и деталей машин [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27].…”