CAJ | 학술논문

以往的拉弯实验研究都是基于传统的拉弯成形机，设备造价高，操作复杂。本文以矩形截面型材为研究对象，基于弹塑性弯曲工程理论的基本假设和应变的可叠加原理构建了矩形截面型材拉弯的力学模型，讨论了拉弯变形后型材横截面上应力应变分布的不同情况，进一步揭示了拉弯成形的变形机理。设计了一种新型的拉弯实验模具并开展了矩形截面型材拉弯弹复的实验研究，针对某一矩形截面型材，在弯曲半径为200 mm 和300 mm时，获取了型材回弹后的半径与截面拉力的关系。利用有限元分析软件ABAQUS开展了基于物理实验的有限元模拟分析，物理实验和有限元分析所获得的拉弯弹复规律与理论解析结果一致，数据吻合。该模具造价低廉，结构简单，操作方便。实验结果可靠，具有一定的理论研究和工程指导价值。
이왕적랍만실험연구도시기우전통적랍만성형궤，설비조개고，조작복잡。본문이구형절면형재위연구대상，기우탄소성만곡공정이론적기본가설화응변적가첩가원리구건료구형절면형재랍만적역학모형，토론료랍만변형후형재횡절면상응력응변분포적불동정황，진일보게시료랍만성형적변형궤리。설계료일충신형적랍만실험모구병개전료구형절면형재랍만탄복적실험연구，침대모일구형절면형재，재만곡반경위200 mm 화300 mm시，획취료형재회탄후적반경여절면랍력적관계。이용유한원분석연건ABAQUS개전료기우물리실험적유한원모의분석，물리실험화유한원분석소획득적랍만탄복규률여이론해석결과일치，수거문합。해모구조개저렴，결구간단，조작방편。실험결과가고，구유일정적이론연구화공정지도개치。
The past experimental research is usually based on the traditional equipment with high cost and complex operation. In this paper, the profile with rectangular cross-section is taken as research object. The mechanical models of profile stretch-bending are established based on the classical elastic-plastic theory and the characteristic of strain superposition. Different cases of stress distribution on the profile cross-section after stretch-bending deformation are discussed to reveal the deformation mechanism of stretch-bending. A new set of mold for stretch-bending experiments is designed and the experimental research on stretch-bending of profile with rectangular cross-section is carried out. The relationships between radius after springback and tensions are obtained when the bending radius are 200 mm and 300 mm. Based on the physical experiment, a finite element simulation analysis is carried out using software ABAQUS. The springback laws of stretch-bending obtained by experiment and finite element analysis are agreed well mutually. This experimental mold has advantages of low cost, simple structure and convenient operation. It will provide base for theoretical research and engineering practice.