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Qinglin Wu,Fei Yao,Xinwu Xu,Changtong Mei,Dingguo Zhou 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
Thermal degradation behavior of rice straw fibers under isothermal heating conditions was studied. The data were modeled by considering the fiber as one pseudo-component using the Malek method. The kinetic model with reaction order n > 1 [i.e., RO(n > 1) = (1-a)n] described the degradation process of rice straw fiber fairly well in a temperature range up to about 265 8C. The kinetic parameters used include activation energy of 116±5 kJ/mol, reaction order of 3.0±0.2, and logarithmic value of preexponential factor [ln A] of 18.7 ±0.1 ln s-1. The model obtained can be used to aid the development of straw fiber-engineering plastic composites.
Research on Local Buckling of Stainless Steel Lipped C-Section Beam Around Strong-Axis
Shenggang Fan,Hang Zhou,Zhixia Ding,Chenxu Li,Qinglin Jiang 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.5
To study the local buckling capacity of stainless steel beams with lipped C-sections under strong axis bending, tensile tests were performed on 12 stainless steel coupons based on S30408 austenitic stainless steel (AISI304) in fl at and corner areas, and mechanical properties and stress–strain curves were obtained. Then, local buckling capacity tests were performed on 6 specimens of stainless steel beams under strong axis bending to determine their mechanical properties and failure mechanism. The failure phenomenon, load–displacement curve, load–strain curve and local buckling capacity were determined. Results show that the failure modes of the specimens are local buckling failure of the fl ange and web at mid-span. Additionally, a refi ned fi nite element analysis model was developed using Python and ABAQUS to simulate and analyse the mechanical performance and local buckling capacity. Then, the analytical results were compared to the test results, and the accuracy of the refi ned model was verifi ed. Then, the refi ned model of the stainless steel C-section beam was simplifi ed including the constraint simplifi cation model, which considered diff erent fl ange constraints and initial imperfections, and the length simplifi cation model, which was based on diff erent length and support constraints. The comparative analysis results showed that the constraint simplifi cation model can simulate the local buckling failure mode more accurately than other models. Additionally, initial imperfections were shown to have little eff ect on the local buckling capacity; however, specimen length and the bearing constraint condition did aff ect the local buckling capacity.