CAJ | 학술논문

最大弯曲正应力是衡量夹层梁弯曲性能的重要参数之一，本文推导出了将软夹芯夹层梁等效成等截面均质单层梁计算最大弯曲正应力的方法，并在此基础上进行三点弯曲试验的算例研究。结果表明：修正单层梁理论与层合梁理论计算的结果是一致的。当破坏载荷与夹层梁横截面的尺寸一定时，随着芯层与总厚度比的增加，修正单层梁理论计算的最大正应力值逐渐增加，而单层梁理论计算的结果为一恒定值。最大弯曲正应力修正公式的建立为夹层梁的工程应用提供理论基础。
최대만곡정응력시형량협층량만곡성능적중요삼수지일，본문추도출료장연협심협층량등효성등절면균질단층량계산최대만곡정응력적방법，병재차기출상진행삼점만곡시험적산례연구。결과표명：수정단층량이론여층합량이론계산적결과시일치적。당파배재하여협층량횡절면적척촌일정시，수착심층여총후도비적증가，수정단층량이론계산적최대정응력치축점증가，이단층량이론계산적결과위일항정치。최대만곡정응력수정공식적건립위협층량적공정응용제공이론기출。
Maximum bending normal stress is one of the important parameters to measure flexural property of sandwich beam. Therefore,new methodology to calculate the stress is pro-posed based on the equivalent single beam theory,after that the numerical examples are demon-strated according to three point flexure test. The results showed that revised single beam theory (RSBT) are equivalent to multi-layer theory (MLT). When cross section of beam and maximum loading are fixed,the maximum bending normal stress calculated by RSBT is increased accord-ingly with increasing ratio of core thickness to the whole,but the result is constant for single beam theory (SBT). RSBT is set up to provide a new method for sandwich construction applica-tion in engineering industry.