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为研究保温材料—原竹界面的粘结应力与滑移分布,进行了12个试件的拉拔试验。研究界面的破坏模式、粘结机理及影响粘结强度的因素,并给出提高原竹与保温材料粘结性能的措施。研究结果表明:原竹与保温材料界面的粘结力由化学胶结力、机械咬合力及摩擦力三部分组成。通过建立两类典型粘结滑移曲线,提出二者的粘结受力过程可分为四个阶段:无滑移段、滑移段、摩擦段、后滑移段。原竹与保温材料包裹长度越多、原竹表面越粗糙、原竹直径越小,其界面的粘结强度越大。其中,原竹表面粗糙度的影响最大,彻底改变了粘结强度的变化规律。对原竹表面进行粗糙度处理、选用直径较小的原竹、将保温材料全面包裹原竹可以提高原竹与保温材料的粘结性能。
In order to study the bond stress and slip distribution of the insulation material - the original bamboo interface, the pullout test of 12 specimens was carried out. The failure mode, bonding mechanism and the factors that affect the bond strength were studied. The measures to improve the bonding properties between raw bamboo and heat preservation material were given. The results show that the bonding strength between the original bamboo and the insulation material is composed of three parts: the chemical bonding force, the mechanical bite force and the friction force. By establishing two types of typical bond slip curves, the process of bond stress between the two is proposed to be divided into four stages: no-slip section, slip section, friction section and post-slip section. The longer the length of the original bamboo and insulation materials, the more rough the original bamboo surface, the smaller the diameter of the original bamboo, the greater the bond strength of the interface. Among them, the original bamboo surface roughness of the greatest impact, completely changed the bond strength changes. Raw bamboo surface roughness treatment, the selection of smaller diameter of the original bamboo, the insulation material will be fully wrapped the original bamboo bamboo can improve the bonding properties of insulation materials.