Investigation of Internal Cracks in Epoxy-Alumina Using In Situ Mechanical Testing Coupled with Micro-CT
Investigation of Internal Cracks in Epoxy-Alumina Using In Situ Mechanical Testing Coupled with Micro-CT
复制标题
使用原位机械测试结合显微 CT 研究环氧氧化铝的内部裂纹
DOI:
10.1007/s11837-021-04714-x
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发表时间:
2021
期刊:
影响因子:
2.6
通讯作者:
Du, Jing
中科院分区:
文献类型:
--
作者:
Tang, Yichun;Su, Kangning;Man, Ruyi;Hillman, Michael C.;Du, Jing
Polymer-ceramic composites are widely used in biomedical applications. This paper presents the results of an experimental investigation on the crack extension inside epoxy-alumina. Specimens with 5 vol.%, 10 vol.%, …, 25 vol.% fillers fractions were fabricated. Three-point bending on single-edge notched bend specimens were performed using conventional mechanical tester and in situ mechanical tester coupled with micro-CT, respectively. Fracture toughness was measured to be 2.10–2.51, and it decreased with increasing filler fraction. When cracks were shorter than 0.88 mm, crack resistance for 5 and 25 vol.% epoxy-alumina was similar. Beyond 0.88 mm, 25 vol.% epoxy-alumina exhibited no crack resistance, whereas stress intensity factor kept increasing in 5 vol.% epoxy-alumina. The matrix-particle interfaces were the weakest link, where cracks often initiated from. Crack bridging by uncracked ligament and crack deflection were commonly observed toughening mechanisms. To design robust epoxy-alumina composites, increasing matrix-particle interface strength is recommended for future work.
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DOI:
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期刊:
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Spearing, S. M.