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Measurement of the X-ray Elastic Constants of Amorphous Polycarbonate

机译：测量无定形聚碳酸酯的X射线弹性常数

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In polymer materials, residual stress introduced during injection molding affects yield reduction due to deformation during molding and delayed fracture during operation, so the establishment of nondestructive stress evaluation of polymer products is desirable. The X-ray elastic constants of polycarbonate were measured for the purpose of obtaining fundamental data for X-ray stress measurement of amorphous polymer materials. The structural function was obtained from the diffraction data, and the strain measured by X-ray was determined from the shift of the first peak by the Q-space method. The peak position was determined using the pseudo-Voigt function approximation method and the diffraction line width method. The Young’s modulus measured by X-ray obtained by the diffraction line width method was close to the mechanical value. Although these values varied widely, they changed depending on the peak ratio. A simple and practical measurement method directly using the raw profile data was also discussed. The Young’s modulus determined by the diffraction line width method decreased with increasing peak ratio. On the other hand, the values determined by the pseudo-Voigt method were almost constant, irrespective of the peak ratio. The strain calculated by the line width method was determined more accurately than that by the pseudo-Voigt method.
机译：在聚合物材料中，注塑期间引入的残余应力会影响由于在运行过程中模塑和延迟断裂期间的变形而导致的屈服减少，因此需要建立聚合物产物的非破坏性应力评估。测量聚碳酸酯的X射线弹性常数，以获得无定形聚合物材料的X射线应力测量的基本数据。从衍射数据获得结构功能，并且通过Q空间方法从第一峰的偏移确定通过X射线测量的应变。使用伪Voigt函数近似方法和衍射线宽法测定峰值位置。通过衍射线宽法获得的X射线测量的杨氏模量接近机械值。虽然这些值广泛变化，但它们根据峰值比而改变。还讨论了使用原始配置文件数据的简单和实用的测量方法。由衍射线宽法确定的杨氏模量随着峰值的增加而降低。另一方面，无论峰值比如何，由伪voigt方法确定的值几乎是恒定的。通过伪voIGT方法更精确地确定通过线宽法计算的应变。

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