Experimental studies on the uniaxial ratchetting of polycarbonate polymer at different temperatures

Temperature‐dependent uniaxial ratchetting of ultra‐high molecular weight polyethylene

“…This may be caused by the occurrence of the remarkable viscous deformation at the stress level of 0.3σ y ± 0.4σ y (σ y = 20.7 MPa). Such ratchetting of the UHMWPE is similar to that of other polymers, 10,15,17,18 such as the polyetherimide, PTFE, PC and polymethyl methacrylate polymers. (2) After the ratchetting test, the residual strain is partially recovered after holding for 1 h at the level of zero stress, and the recoverable ratio is about 63%, as shown in Fig.…”

Experimental and numerical investigations of evaluation criteria and material parameters' coupling effect on polypropylene scratch

“…As reported by Jiang et al , the simplified constitutive model shows a similar tendency for the scratch behavior of PP with the true stress–strain curve model. The complex material properties, such as viscosity , should be considered to quantitatively describe the scratch deformation in the future work. To cover the ranges of E and σ y of the prepared PP specimens, the values of E used in the FE simulations range from 500 to 1,350 MPa, as well as σ y from 20 to 33 MPa, respectively.…”

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

“…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.…”