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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。
A new type of bamboo engineering component - corrugated bamboo veneer composite material (CBLC) has been explored. Three typical pavement types (type Ⅰ: (0 °) 6; type Ⅱ: (0 ° / 90 °) 3; type Ⅲ: (90 °) 6) on the tensile, two-way bending and three-dimensional compressive properties, and the bending strain field information was characterized by digital speckle correlation method (DSCM) The results show that the pavement type has obvious influence on the mechanical properties. For the tensile and longitudinal bending properties, type Ⅰ> type Ⅱ> type Ⅲ, and transverse bending type Ⅱ> type Ⅲ> type Ⅰ. The tensile and fracture mechanisms of CBLC under different types of pavement are also different: type Ⅰ is ductile fracture, type Ⅱ is gradually stratified fracture, and type Ⅲ is brittle fracture. The strain fields in the x and y directions are concentratedly distributed at the outermost corrugated corrugated junction at the bottom of the specimen, and Exx x> z. The pavement type has a great influence on the compressive load and compressive strength of CBLC, but the compressive modulus has no significant difference.