The Effect of Environment on The Fatigue and Fracture Response of Advanced Polymers and Composites

环境对先进聚合物和复合材料疲劳和断裂响应的影响

• 批准号: 9410979
• 负责人: Lisa Pruitt
• 金额: $ 1.8万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-09-01 至 1996-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9410979&HistoricalAwards=false
• 关键词: Effect; Environment; Fatigue; Fracture; Response

ABSTRACT CTS-9321887 William Marsh Rice University P. I.: Riki Kobayashi A new five-parameter extended corresponding states model has been developed for viscosity and proton spin-lattice relaxation rate applicable to a variety of hydrocarbons in the dense fluid phase. Simple mixing rules allows extension of the model to mixtures. This proposed model is shown to bring improvements over the viscosity model of Ely and Hanley 1, 2 , for cyclic and branched alkanes, and their mixtures with n-paraffins. The corresponding states treatment of the proton spin-lattice relaxation rate, R1, yields a new correlation between R1 and temperature for saturated hydrocarbons, spanning three different processes of spin relaxation (i.e. spin-rotation, intramolecular and intermolecular dipole-dipole mechanisms). Accurate correlations between {SYMBOL 104 \f "Symbol"} are generated for pure and mixed fluids, with observed root-mean-square deviations of less than 8.0%. This new approach utilizes shape factors 3 to properly predict p-v-t surfaces; and two additional constants to account for transport. The new parameters, {SYMBOL 103 \f "Symbol"} for viscosity, and {SYMBOL 98 \f "Symbol"} for R1, mainly arise from hindered rotation of polyatomic molecules. The four-parameter corresponding states treatment, utilizing only the shape factors 3 , yields correlations of comparable accuracy, when confined to long-chain alkanes.

摘要CTS-9321887 William Marsh Rice University P. 简单的混合规则允许将模型扩展到混合物。 该提出的模型被证明可以改善与Ely和Hanley 1、2的粘度模型，以循环和分支的烷烃及其与N- paraffins的混合物相比。 质子自旋晶格松弛速率R1的相应状态处理可为饱和烃的R1与温度之间的新相关性，涵盖了三种不同的自旋松弛过程（即自旋旋转，分子内和分子间和分子间和分子间偶极 - 偶极 - 偶极杆机制）。 {符号104 \ f“符号”}之间的准确相关性是为纯流体和混合流体生成的，观察到的根平方偏差小于8.0％。 这种新方法利用形状因子3来正确预测P-V-T表面。还有两个额外的常数要考虑运输。 新参数，{符号103 \ f“符号”}用于粘度，{符号98 \ f“符号”}对于r1，主要来自多原子分子的阻碍旋转。 仅利用形状因子3的四参数相应的状态处理，当局限于长链烷烃时，可以产生可比精度的相关性。