U.S.-Polish Cooperative Research on Development of Guidelines for Heat Straightening

9407158 Roeder华盛顿大学的Charles Roeder博士和华沙理工大学的Henryk Zobel博士在“热矫直指南的发展”方面进行了美国-波兰联合合作研究。当金属在高温下受到应力或热梯度作用时，就会发生塑性变形。这种变形通常用于热矫直或热弯曲方法，以修复损伤或减少构件的初始曲率。虽然这种变形相当重要，但人们对它们知之甚少。这种缺乏理解的结果是有限的使用（在某些情况下，误用）热矫直方法。通过对该方法的合理理解，工程师将能够预测(1)适合矫直的构件；(2)加热引起的变形；（三）供热所需的位置和数量；(4)热应用的次数和顺序。这种估计现在是由经验丰富的金属工人做出的，他们的估计变化很大，而且往往非常不准确。本建议旨在扩展对热矫直的现有理解。波兰P.I.将利用最近在波兰使用热矫直修复桥梁的实践经验，以及在开发预测模型行为的经验模型方面的理论经验。美国P.I.在热效应和热矫直方法方面有着丰富的研究经验。他进行了许多实验和广泛的温度相关非弹性分析。最终，研究人员希望通过监测几个实际的矫直项目，制定实用的指导方针来使用和控制热矫直，并验证指导方针。这项土木工程方面的拟议研究实现了推进科学的计划目标，使美国和波兰的领先专家能够结合互补的人才，并在共同感兴趣和有能力的领域汇集研究资源。# #

9407158 Roeder This U.S.-Polish Joint Cooperative Research in "Development of Guidelines for Heat Straightening" is between Dr. Charles Roeder of the University of Washington and Dr. Henryk Zobel Warsaw Polytechnic University. Plastic deformations occur when metals are subjected to a stress or a thermal gradient at elevated temperatures. This deformation is commonly used in the heat straightening or heat curving method to repair damage or reduce initial curvature in the member. Though such deformations are of considerable importance, they are poorly understood. This lack of understanding results in limited use (and, in some cases, misuse) of the heat straightening method. With a rational understanding of the method, engineers will be able to predict (1) the members suitable for straightening; (2) the deformation resulting from heating; (3) the required location and quantity of heating; and (4) the number and sequence of heat applications. Such estimates now are made by experienced metalworkers, whose estimates are highly variable and often grossly inaccurate. This proposal seeks to extend the existing understanding of heat straightening. The Polish P.I. will draw on recent practical experience in using heat straightening to repair bridges in Poland, and theoretical experience in developing an empirical model for predicting the behavior of the model. The American P.I. has had extensive research experience with thermal effects and the heat straightening method. He has performed many experiments and a wide range of temperature-dependent inelastic analyses. Ultimately, the researchers hope to develop practical guidelines to use and control heat straightening and verification of guidelines through monitoring several actual straightening projects. This proposed research in civil engineering fulfills the program objectives of advancing science by enabling leading experts in the U.S. and Poland to combine complementary talents and pool research resources in areas of strong mutual interest and competence. ##