| 陈通,彭光健*,张泰华.相变微胶囊单体破坏极限的评估方法[J].实验力学,2018,33(1):17~23 |
| 相变微胶囊单体破坏极限的评估方法 |
| On the evaluation method of failure limit of monomer phase change microcapsule |
| 投稿时间：2017-01-09 修订日期：2017-03-20 |
| DOI：10.7520/1001-4888-17-004 |
| 中文关键词: 相变微胶囊 破坏载荷 破坏极限 压缩应变 环向应变 |
| 英文关键词:phase change microcapsules failure load failure limit compressionstrain circumferential strain |
| 基金项目:国家自然科学基金项目(11402233)；国家自然科学基金项目(11672356)；浙江省公益技术应用研究项目(2015C31074)资助 |
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| 中文摘要: |
| 以密胺树脂壳石蜡相变微胶囊为研究对象，通过激光粒度仪测定微胶囊的粒径分布，借助激光共聚焦显微镜选取典型粒径的微胶囊单体(记录其直径和形貌)，采用纳米压入仪和平底压头测试不同粒径微胶囊单体的破坏载荷。基于对称变形和体积守恒假设，建立微胶囊单体破坏极限的评估方法。研究发现，微胶囊单体破坏载荷随粒径的增大近似成线性增大，但其压缩破坏应变和环向破坏应变均与粒径大小无关，分别为34.5%±3.0%和34.2%±5.1%。因此，可采用压缩破坏应变或环向破坏应变表征微胶囊单体破坏极限。 |
| 英文摘要: |
| Taking melamine resin shell paraffin phase change microcapsules as research object, particle size distribution of micro capsule was determined by laser particle size instrument. The typical size microcapsules were selected by laser scanning confocal microscopy (LSCM), their diameter and morphology were recorded. The failure load of microcapsule monomer with different particle sizes was measured by nano-indentation instrument and flat head indenter. Based on the assumption of symmetry deformation and volume conservation, a method for evaluating failure limit of microcapsule monomer was established. Study reveals that the failure load of microcapsule monomer near linearly increases along with the increase of particle size, but its compression failure strain and circumferential failure strain have nothing to do with size, are 34.5%±3.0% and 34.2%±5.1%, respectively. So it is possible to take compression failure strain and circumferential failure strain to characterize the failure limit of microcapsule monomer. |
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