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首页> 外文会议>ASME Pressure Vessels and Piping Division/K-PVP conference;PVP2010 >A NEW APPROACH TO CREATING COMPOSITE MATERIALS ELASTIC PROPERTY DATABASE WITH UNCERTAINTY ESTIMATION USING A COMBINATION OF MECHANICAL AND THERMAL EXPANSION TESTS (*)
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A NEW APPROACH TO CREATING COMPOSITE MATERIALS ELASTIC PROPERTY DATABASE WITH UNCERTAINTY ESTIMATION USING A COMBINATION OF MECHANICAL AND THERMAL EXPANSION TESTS (*)

机译：结合使用机械和热膨胀测试（*）建立具有不确定性估计的复合材料弹性属性数据库的新方法（*）

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In composite structural design, a fundamental requirement is to furnish the designer with a set of elastic constants. For example, to design for a given temperature a laminate consisting of transversely isotropic fiber-reinforced laminae, we need five independent elastic constants of each lamina of interest, namely, E_1, E_2, V12, G12, and V23.At present, there exist seven tests, two of mechanical-lamina, two of thermal-expansion-lamina, and three of thermal-expansion-laminate types, to accomplish this task. It is known in the literature that the mechanical tests are capable of measuring E,, E_2, and v_(12), whereas the two thermal-expansion-lamina tests will measure α_1 and α_2, and the three thermal-expansion-laminate tests yield an over-determined system of three simultaneous equations of the remaining two unknown elastic constants, G12 and v_(23).In this paper, we propose a new approach to determining those five elastic constants with uncertainty bounds using the extra information obtainable from an over-determined system. The approach takes advantage of the classical theory of error propagation for which variance formulas were derived to estimate standard deviations of some of our five elastic constants. To illustrate this approach, we apply it to a set of experimental data on PEEK/IM7 unidirectional laminaThe experiment consists of the following tests: Two tensile tests with four samples of unidirectional specimens to measure E_1, E_2 and V_12; two thermal-expansion-lamina tests for coefficients (α_1 and α_2) each using four [(0)_(32)]t unidirectional specimens; and three thermal-expansion-laminate tests on four samples of [(+30/-30)_8]_s laminates.The results of our new approach are compared with those of a similar but more ad hoc approach that has appeared in the literature. The potential of applying this new methodology to the creation of a composite material elastic property database with uncertainty estimation and to the reliability analysis of composite structure is discussed.
机译：在复合结构设计中，基本要求是为设计师提供一组弹性常数。例如，要在给定温度下设计由横向各向同性纤维增强薄片组成的层压板，我们需要每个感兴趣的薄片的五个独立的弹性常数，即E_1，E_2，V12，G12和V23。 目前，存在七个测试，其中两个是机械薄板，两个是热膨胀薄板，另外三个是热膨胀层压板类型，可以完成此任务。在文献中已知机械测试能够测量E，E_2和v_（12），而两个热膨胀层测试将测量α_1和α_2，而三个热膨胀层合测试会产生一个剩余三个未知弹性常数G12和v_（23）的三个联立方程的超定系统。 在本文中，我们提出了一种新方法，该方法使用从超定系统中获得的额外信息来确定具有不确定范围的那五个弹性常数。这种方法利用了误差传播的经典理论，该理论导出了方差公式来估计我们五个弹性常数中某些弹性常数的标准偏差。为了说明这种方法，我们将其应用于一组关于PEEK / IM7单向薄片的实验数据 该实验包括以下测试：两次拉伸测试，使用四个单向样本的样品来测量E_1，E_2和V_12;使用四个[（0）_（32）] t单向样本分别进行两个系数（α_1和α_2）的热膨胀层测试;并在[（+ 30 / -30）_8] _s层压板的四个样本上进行了三个热膨胀层压板测试。 我们的新方法的结果与文献中出现的类似但更特殊的方法的结果进行了比较。讨论了将这种新方法应用于具有不确定性估计的复合材料弹性特性数据库的创建以及对复合结构可靠性分析的潜力。

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