Measurement of the X-ray Elastic Constants of Amorphous Polycarbonate
Measurement of the X-ray Elastic Constants of Amorphous Polycarbonate
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DOI：
10.3390/qubs4040035
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发表时间：
2020-12-01
影响因子：
1.4
通讯作者：
Akiniwa, Yoshiaki
中科院分区：
文献类型：
--
作者：
Kawamura, Yuki;Akiniwa, Yoshiaki
在高分子材料中，注塑成型过程中引入的残余应力会因成型过程中的变形和操作过程中的延迟断裂而影响成品率的降低，因此建立高分子制品的无损应力评价是可取的。测量了聚碳酸酯的X射线弹性常数，为非晶态高分子材料的X射线应力测量提供了基础数据。从衍射数据获得结构函数，并且通过X射线测量的应变通过Q空间方法从第一峰的位移确定。使用伪Voigt函数近似法和衍射线宽法确定峰位置。用X射线衍射谱线宽度法测得的杨氏模量与力学值接近。虽然这些值变化很大，但它们根据峰比而变化。并探讨了一种简单实用的直接利用原始轮廓数据进行测量的方法。用衍射线宽法测得的杨氏模量随峰比的增大而减小。另一方面，由伪Voigt方法确定的值几乎是恒定的，与峰比无关。线宽法计算的应变比伪Voigt法更准确。
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.