• 作者： 林偉煌; 仁明華; 曾富鑫
• 作者服務機構： 陸軍官校軍事工程系; 中山大學機械所
• 中文摘要： 本文旨在製造並利用實驗與數值解析方法來探討顆粒複材承受壓力之機械性能，選用空心玻璃珠取代實心顆粒任意填充於顆粒複材中固化製成浮材以符合所需之特性。在實驗方面試體分成二類(a)具相同之顆粒尺寸但改變顆粒體積百分比，(b)不同顆粒大小組成相同之顆粒體積百分比，經過壓力破壞實驗，我們獲致破壞強度及破壞斷面以印證裂縫生長之模式。至於數值工作，簡化起見我們考慮二維平面應變狀態及三維旋轉軸對稱形式，利用有限元素法及商用軟體配合八節點二次等參元素及四邊形環元素切割以計算出最大拉應力之值及位置，發現數值預測與實驗結果很吻合，最後亦得到試體之顆粒大小固定但顆粒體積百分比較大時，強度會降低，對小顆粒尺寸時最明顯，然而，試體之顆粒百分比固定時，顆粒較大時強度較高。
• 英文摘要： The objeetlve of this work was to manufaeture and investngate the mechanicaI properties of particulatecomposites due to comPression by empirical and numerical analyses Glass bubbles as filler,instead ofspherical solid partlcles,spreading randomly into epoxy resin to cure particulate composites as floatingmaterial possess the speeial features required. In experiments,the specimens were manufactured into twotypes (l) coupons of the same partleles, size with varied particle volume fraetions and (2) coupons of thesarne partiele volume fraetion with different particle sizes. From the compression tests, we obtained thefraeture strength and observed the fracture surfaces to mateh our chosen craek growing model As fornumerical work, the two-dimensional(2-D) plane strain condition and three-dimensional (3-D) axissyrnmetry were used to simplify and simulate the problern. Following the finite element method (FEM),commereial software with eight-node quadratic isoparametric elements and quadrilateral rxngs was　adoptedand ineorporated withe elementrefinerment and computation to yield the valuesand locations of the maximurntensile stresses of specimens. The numerical prediction compares well with experirmental results. Finallywe find that for a fixed particle size, specimens with larger particle volume fraction will be reduced instrength, more obviously for smaller particles. However, for fixed volume fraction of particles, specimenswill become stronger with larger particle size
• 中文關鍵字： particulate composite; manufacturing; fracture; strength; Young's modulus; FEM
• 英文關鍵字： --