A Study on Impact Characterictics of Sandwich Plated Structures

夹层板结构冲击特性研究

基本信息

批准号：
04650410
负责人：
KOBAYASHI Harutoshi
金额：
$ 0.96万
依托单位：
OSAKA CITY UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650410/
关键词：
Impact response Stress wave propagation Sandwich structures Multi-layred plates Dynamic bond stress Eigenfunction expansion Rigid body spring model Fracture 動弾性論動的付着応力

项目摘要

(1)The propagation of elastic stress waves in sandwich type plated structures such as sandwich beams, ciecular plates, hollow cylinders and shperes, is investigated. Based on the theory of elastodynamics the method of eigenfunction expansion has benn developed to obtain exact solutions for these elastic impact response problems. Numerical calculations are performed for the various sandwich type sutrctures, especially, stee-concrete composit ones, and stresses variations at transient states and long time states are obtained. A comparison between the maximum dynamic stress and the corresponding static stress shows that the dynamic factor is 2 for beams and plates, but for hollow cylinders and shperes the dynamic factor to be low in varying degree depending on the particular loading condition, view points of stress, etc.(2)Considering non-linear behabiour, numerical analysis of impact fracture of reinforced concrete rock sheds are made usig Rigid Body Spring Model. A number of numerical simulations are executed under various loading conditions such as weights of rock-mass, rock fall-heights, collisions angles of rock-fall and so on. Two types of faliure mode are observed, one is bending failure mode and the other is shear failure mode due to diagonal cracks of concrete. From the numerical results obtained, the difference between the statical and the impact characteristics of the rock sheds are revealed.

（1）研究了三明治类型的板条结构中的弹性应力波的传播，例如三明治梁，木板板，空心圆柱体和shperes。基于弹性动力学理论，本本函数扩张的方法已开发出来为这些弹性影响响应问题获得精确的解决方案。对各种三明治型Sutrctures进行了数值计算，尤其是Stee-Croccete Composit，并获得了瞬态状态和长时间状态的应力变化。最大动态应力与相应的静电应力之间的比较表明，梁和板的动态因子为2，但是对于空心气缸和降低动态因子在不同程度下的动态因子，取决于特定的载荷条件，应力的观点，等等。（2）考虑到非线性贝拜，对钢筋混凝土岩棚的影响骨折的数值分析已成为USIG刚体弹簧模型。在各种加载条件下进行了许多数值模拟，例如岩石质量的重量，岩石秋季高度，岩石倒碰撞角，等等。观察到两种类型的Faliure模式，一个是弯曲故障模式，另一种是由于混凝土的对角线裂纹引起的剪切故障模式。从获得的数值结果中，揭示了岩石棚的统计和影响特征之间的差异。