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瓦楞型竹束单板复合材料的制备及力学性能表征

, PP. 82-86

Keywords: 竹质工程材料,瓦楞结构,力学性能,数字散斑相关方法,三维压缩

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Abstract:

探索了一种新型竹质工程构件——瓦楞型竹束单板复合材料(CBLC)的制备工艺,研究了三种典型铺装类型(Ⅰ型:(0°)6;Ⅱ型:(0°/90°)3;Ⅲ型:(90°)6)对其拉伸、双向弯曲、三维压缩性能的影响,同时利用数字散斑相关方法(DSCM)对其弯曲应变场信息进行了表征。结果表明:铺装类型对各项力学性能有明显影响,对于拉伸、纵向弯曲性能,Ⅰ型>Ⅱ型>Ⅲ型,对于横向弯曲,Ⅱ型>Ⅲ型>Ⅰ型。不同铺装类型下CBLC的拉伸断裂机制亦各不相同:Ⅰ型为延性断裂,Ⅱ型为逐渐分层断裂,Ⅲ型为脆性断裂。x和y方向应变场集中分布在试样底端最外层瓦楞波形连接处,且Exxx>z;铺装类型对CBLC的抗压载荷、抗压强度有很大影响,而抗压模量差异不明显。

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