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1.青岛理工大学 理学院, 山东 青岛 266520
2.青岛博瑞科三维制造有限公司, 山东 青岛 266000
Received:03 December 2020,
Revised:25 December 2020,
Published:2021-05
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Bin ZHANG, Yi-chen ZHONG, Fan-xiu CHEN, et al. Mechanical properties analysis of 3 D printed specimens with different orientations based on DIC[J]. Chinese journal of liquid crystals and displays, 2021, 36(5): 673-679.
Bin ZHANG, Yi-chen ZHONG, Fan-xiu CHEN, et al. Mechanical properties analysis of 3 D printed specimens with different orientations based on DIC[J]. Chinese journal of liquid crystals and displays, 2021, 36(5): 673-679. DOI: 10.37188/CJLCD.2020-0331.
不同的构建取向对熔融沉积成型的标准试样的力学性能有着显著影响。本文采用聚乳酸线材,使用熔融沉积式3D打印方法制备站立式、侧立式、平躺式3种不同方向打印成型的试样,采用数字图像相关方法实时分析并记录试样拉伸与弯曲变形过程。使用该测量系统能够有效获取试样的真实变形与应变,结合试验机数据给出更为精确的应力-应变曲线,通过对应变云图中线状区域的观察能够准确地预测断裂发生的时间与位置,比较不同构建取向成型的工艺对打印制品的力学性能的影响。试验结果表明:站立式打印的试件在拉伸试验和3点弯曲试验中没有明显颈缩现象,其变形、伸长率以及强度也是最低的,呈现出脆性材料所具有的特性。侧立式具有很好的抗拉性能,其颈缩现象出现后发生很小的变形就会断裂,所能承受的力呈现直线下降的趋势,直至断裂。平躺式的强度相近于侧立式,其发生颈缩现象直至断裂变形量相对侧立式要大,且应力随着变形的增大表现出较为平缓减小的特征,强度、延展性等呈现出最佳的机械性能。
Different construction orientations have a significant influence on the mechanical properties of the standard samples of fused deposition modeling (FDM). In this paper
polylactic acid (PLA) wire rod was used to prepare three kinds of printing samples in three different directions: standing
side standing and lying down
The digital image correlation (DIC) method was used to analyze and record the tensile and bending deformation process of the sample in real time. The real deformation and strain of the sample can be obtained effectively by using the measurement system
and the more accurate stress-strain curve can be obtained combined with the test machine data. Through the observation of the linear region in strain nephogram
it can accurately predict the time and location of fracture
and compare the mechanical properties of different oriented forming processes on printed products performance impact. The test results show that there is no obvious necking phenomenon in the tensile test and three-point bending test
and its deformation
elongation and strength are also the lowest
showing the characteristics of brittle materials. The lateral vertical has good tensile properties. After the necking phenomenon occurs
it will fracture after a small deformation
and the force that it can bear presents a linear downward trend until it breaks. The strength of the lying down type are similar to those of the side standing type
and the necking phenomenon occurs until the fracture deformation is larger than that of the side standing type
and the stress decreases gently with the increase of deformation
showing the best mechanical properties in strength and ductility.
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