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“制定热矫直指南”中进行了这项美国-波兰联合合作研究。当金属在高温下承受应力或温度梯度时，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，以修复损伤或减小构件的初始曲率。虽然这种变形相当重要，但人们对它们知之甚少。这种认识的缺乏导致了热矫直方法的有限使用(在某些情况下，甚至是误用)。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；(3)所需的加热位置和数量；以及(4)加热的次数和顺序。现在这样的估计是由经验丰富的金属工人做出的，他们的估计非常不稳定，而且往往非常不准确。这项建议旨在扩大现有的对热矫直的理解。波兰P.I.将借鉴最近在波兰使用热矫直修复桥梁的实践经验，以及开发预测模型行为的经验模型的理论经验。美国P.I.在热效应和热矫直方法方面有丰富的研究经验。他进行了许多实验和广泛的温度相关的非弹性分析。最终，研究人员希望制定实用的指南来使用和控制热矫直，并通过监测几个实际的矫直项目来验证指南。这项拟议的土木工程研究通过使美国和波兰的顶尖专家能够将互补的人才结合在一起，并在相互感兴趣和能力很强的领域汇集研究资源，从而实现了推进科学的计划目标。##

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. ##