Hellen De Coninck, Jae Won Choi, Jeroen Soete, Sebastian Meyers, B. Van Hooreweder
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引用次数: 0
摘要
添加式制造的纤维增强聚合物正受到越来越多的关注。在对激光烧结(LS)装置中的新型纤维沉积系统进行开发和优化后,生产出了带玻璃纤维和不带玻璃纤维的聚酰胺 12 试样。在本研究中,我们研究了有纤维和无纤维 LS 试样的结晶度、孔隙率和机械性能之间的关系。在对竣工的 LS 试样进行测试后,发现纤维对试样的性能有不利影响,其 UTS 降低了 6%。结晶度保持不变,但在带有纤维的试样中观察到 2.6% 的孔隙率。这些孔隙会对纤维与基体之间的粘合产生负面影响。为了研究孔隙的影响,对含有和不含纤维的 LS 试样进行了温等静压(WIP)。WIP 工艺对无纤维试样产生了积极影响,使其 UTS 增加了 8.5%。然而,WIP 工艺对有纤维试样的影响要小得多,其 UTS 仅提高了 2%。结晶度和孔隙率都不是导致带纤维 LS 试样 UTS 增幅低于预期的原因。本文提出了一些假设和缓解策略。
Improving the Mechanical Properties of GlassFibre-Reinforced Laser-Sintered Parts Based on Degree of Crystallinity and Porosity Content Using a Warm Isostatic Pressing (WIP) Process
Additively manufactured fibre-reinforced polymers are gaining traction. After the development and optimisation of a novel fibre-deposition system in a laser sintering (LS) setup, polyamide 12 specimens were produced with and without glass fibres. In this study, the relation between the crystallinity, porosity, and mechanical properties of LS specimens with and without fibres is investigated. After testing as-built LS specimens, a detrimental effect of the fibres on the specimens’ performance was observed with a decrease in UTS of 6%. The degree of crystallinity remained the same; however, a porosity content of 2.6% was observed in specimens with fibres. These pores can have a negative influence on the bonding between the fibres and the matrix. To investigate the influence of the pores, warm isostatic pressing (WIP) was performed on LS specimens with and without fibres. The WIP process shows a positive influence on the specimens without fibres, resulting in an increase in UTS of 8.5%. The influence of the WIP process on specimens with fibres, however, is much less pronounced, with an increase in UTS of only 2%. Neither the crystallinity nor the porosity are the cause of the less-than-expected increase in UTS in LS specimens with fibres. A number of hypotheses and mitigation strategies are provided.