Effect of Graded Transition Layer on Tensile Strength and Ductility of Parallel Structures of Heterogeneous Resin Materials
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摘要: 选择弹性模量依次减小的7种树脂材料，利用多材料喷射打印技术制备由最大和最小弹性模量材料并联形成的具有4种界面结构的拉伸试样，界面结构分别为无过渡层、宽度3 mm均质过渡层（由弹性模量居中的1种材料组成）以及宽度分别为3，5 mm的梯度过渡层（由另外5种材料组成），分析了其界面成形质量及拉伸性能。结果表明：无过渡层试样的界面处存在纹道和较多孔洞，成形质量较差；添加均质过渡层后，界面缺陷减少，拉伸强度略微增大，但是断裂应变降低了14.8%；添加梯度过渡层后，界面成形质量进一步提高，拉伸强度略微增大，延性明显提高，含宽度3，5 mm梯度过渡层试样的断裂应变分别比无过渡层试样提高了10.6%，37.9%。Abstract: Seven resin materials with decreasing elastic moduli were selected.Tensile specimens with four interface structures were prepared by multi-material jet printing of two materials with the smallest and the largest elastic moduli; the two materials were connected parallelly.The interface structures were listed as follows:without transition layer, with homogeneous transition layer (composed of one material with mediate elastic modulus), and with 3 mm and 5 mm thick graded transition layers (composed of other five materials).The interface forming quality and tensile properties were analyzed.The results show the specimen without transition layer had grooves and much holes at interfaces, indicating a poor forming quality.With a homogeneous transition layer, the defects at the interface decreased in amounts, the tensile strength increased slightly, but the fracture strain decreased by 14.8%.With graded transition layers, the interface forming quality further increased, the tensile strength increased slightly and the ductility increased obviously.Comparing with that without transition layers, the fracture strains of specimens with 3 mm and 5 mm thick graded transition layers increased by 10.6%, 37.9%, respectively.
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Keywords:
- graded transition layer /
- 3D printing /
- material interface /
- tensile strength /
- ductility
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