CAJ | 학술논문

在船舶领域,以复合材料层合面板及泡沫芯材组成的夹芯复合材料板梁结构已大量应用在游艇及复合材料高速艇上.文章研究了受初始静载荷作用下夹芯复合材料曲梁的面板的局部自由振动问题,并给出一种相应的理论分析方法.文中通过将芯材简化为Winkler弹性地基,将面板简化为一复合材料曲梁,从而使所研究问题蜕化为有初始静载荷作用下弹性地基上任意曲梁的固有振动问题.在局部振动位移是基于初始静载平衡位置并与初始位移相比是小量的假定的基础上,根据能量原理推导出面板的运动方程.研究的结果表明,该面板的局部振动不只取决于面板的弯曲刚度和长度,以及芯材的弹性刚度,也在很大程度上取决于梁的曲率及面板所受到的初始轴向压力.
재선박영역,이복합재료층합면판급포말심재조성적협심복합재료판량결구이대량응용재유정급복합재료고속정상.문장연구료수초시정재하작용하협심복합재료곡량적면판적국부자유진동문제,병급출일충상응적이론분석방법.문중통과장심재간화위Winkler탄성지기,장면판간화위일복합재료곡량,종이사소연구문제세화위유초시정재하작용하탄성지기상임의곡량적고유진동문제.재국부진동위이시기우초시정재평형위치병여초시위이상비시소량적가정적기출상,근거능량원리추도출면판적운동방정.연구적결과표명,해면판적국부진동불지취결우면판적만곡강도화장도,이급심재적탄성강도,야재흔대정도상취결우량적곡솔급면판소수도적초시축향압력.
Sandwich structures with composite laminate face and foam core are widely used in yachts and high speed crafts in ship area. A theoretical approach is provided to investigate the problem of local free vibration of an initially stressed curved sandwich beam in this paper. The equation of motion of the skin is derived from energy principles and based upon small displacements away from an initial,loaded equilibrium state.The core material is simplified as an elastic foundation and the skins are considered as composite beams on an elastic foundation.The investigation shows that the vibration frequencies and modes are dependent not only on the flexural rigidity and length of beam and foundation modulus, but also on geometry of curvature and axial compressive/tensile force.