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일차전단변형이론을 이용한 복합재료 적층평판의 효율적 열응력 해석
한장우,김준식,조맹효,Han, Jang-Woo,Kim, Jun-Sik,Cho, Maenghyo 한국전산구조공학회 2012 한국전산구조공학회논문집 Vol.25 No.6
본 논문에서는 일차전단변형 평판 이론(FSDT)의 개선을 통한 복합재료 적층평판의 효율적 열응력 해석 기법을 제안한다. 횡방향 응력 성분에 대해서만 변분을 취하는 혼합변분이론(Mixed variational theorem)을 이용하여 횡방향 변형에너지를 개선하였다. 가정된 횡방향 전단응력 성분들은 효율적 고차이론으로부터 구하였으며, 면내 변위 성분들은 일차적층평판 이론의 변위장을 사용하였다. 또한, 열응력 해석에 있어서 횡방향 수직 변형을 효과적으로 고려하기 위해서 횡방향 수직 변위를 두께방향에 대하여 포물선으로 가정하였다. 이 과정을 통하여 얻어진 전단변형 에너지를 본 논문에서는 횡방향 수직 변형이 고려된 개선된 일차전단변형이론(EFSDTM_TN)이라고 명명하였다. 제안된 EFSDTM_TN은 복합재료 적층평판의 열탄성 거동을 해석함에 있어서 횡방향 수직 변형이 고려된 일차전단변형 평판 이론(FSDT_TN)과 비슷한 수준의 계산만을 필요로 하며, 동시에 후처리 과정을 통하여 열변형 및 열응력의 두께방향 분포를 정확하게 예측할 수 있도록 개선하였다. 계산된 결과는 FSDT_TN, 3차원 탄성해 등의 결과와 비교하여 검증하였다. In this paper, an efficient yet accurate method for the thermal stress analysis using a first order shear deformation theory(FSDT) is presented. The main objective herein is to systematically modify transverse shear strain energy through the mixed variational theorem(MVT). In the mixed formulation, independent transverse shear stresses are taken from the efficient higher-order zigzag plate theory, and the in-plane displacements are assumed to be those of the FSDT. Moreover, a smooth parabolic distribution through the thickness is assumed in the transverse normal displacement field in order to consider a transverse normal deformation. The resulting strain energy expression is referred to as an enhanced first order shear deformation theory, which is obtained via the mixed variational theorem with transverse normal deformation effect(EFSDTM_TN). The EFSDTM_TN has the same computational advantage as the FSDT_TN(FSDT with transverse normal deformation effect) does, which allows us to improve the through-the-thickness distributions of displacements and stresses via the recovery procedure. The thermal stresses obtained by the present theory are compared with those of the FSDT_TN and three-dimensional elasticity.
횡방향 수직 변형이 고려된 일차전단변형 이론을 이용한 복합재료 및 샌드위치 적층 구조물에 대한 효율적 열-기계적 거동 해석
한장우(Jang-Woo Han),김준식(Jun-Sik Kim),조맹효(Maenghyo Cho) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
An efficient and accurate thermo-mechanical analysis method based on the conventional first-order shear deformation theory (FSDT) is proposed in this paper. The main objective herein is to systematically establish the relationship between two independent fields. To this end, the transverse stresses are obtained from a third-order zigzag model to improve the accuracy, whereas the displacements based on the conventional FSDT are employed to improve the numerical efficiency. Transverse displacement field is extended to quadratic expression without additional unknown variables by superimposing prescribed thermal fields so that transverse normal strain effect can be considered under the plane stress condition. Moreover, in-plane correction factors to satisfy self-equilibrium state of the stress is additionally considered for the general configuration of the laminated composite and sandwich structures. Resulting strain energy expressions are named as enhanced first-order shear deformation theory including transverse normal effect based on mixed variational theorem (i.e. EFSDTM_TN). The EFSDTM_TN possess the same computational advantage of the conventional FSDT while allowing for improved local variations of the stress and displacement via the post-processing procedure. Displacement and stress distributions obtained herein are compared to those available data in the literature.
라플라스 영역에서의 일차전단변형이론을 이용한 복합재료 적층평판의 효율적 점탄성 거동 해석
한장우(Jang-Woo Han),김준식(Jun-Sik Kim),조맹효(Maenghyo Cho) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In this paper, an efficient yet accurate method for the visco-elastic analysis of laminated composite plates using a first-order shear deformation theory(FSDT) is presented. The main objective is to systematically modify the strain energy of first-order shear deformation theory through the strain energy transformation. To this end, the in-plane warping functions based on the efficient higher-order plate theory(EHOPT) are taken to improve their accuracy. And the Laplace transformation is applied to circumvent the overwhelming complexity of dealing with visco-elastic materials. Resulting strain energy expression is referred to as an enhanced first-order shear deformation theory(EFSDT). The EFSDT has the same computational advantage as the classical FSDT does, which allow us to improve the local variations of stresses and displacements via the recovery process. The numerical results are compared to those available in literature.
대학 교직원의 동호인 활동에 따른 생활 만족도에 관한 연구
한장우(Han Jang Woo),권욱동(Kwon Wook Dong),원영신(Won Young sin) 한국여성체육학회 1998 한국여성체육학회지 Vol.12 No.-
The purpose of this study was to subdivide the consciousness and an attendance type for which is the part of the staff of university. Also, it was to compare and analyze the life satisfaction for the staff of university along the kind of the work. To achieve the purpose of this study, self-administered questionnaire was used. The subjects were 393 from 7 private universities. The factor of the life satisfaction was divided 4 categories into the degree of the satisfaction in the work, relation, leisure and health. The Mean, Frequency and Standard deviation were analyzed using SPSS software program. In addition, T-test, ANOVA were used to inspect the hypothesis of this study, and Duncan multiple comparison for the post-inspection. We had the following results. 1. The background for the staff of university is following(sex, period of office, pay, status and university). 1) There was the significant difference between the groups for the degree of life satisfaction in the category of work, relation and health, but no leisure along the sex. 2) There was the significant difference among the groups between groups for the degree of lived-satisfaction in the category of work, leisure and health. but no relation along the status. 3) There was the significant difference among the groups for the degree of life satisfaction in the category of work, leisure and but no relation and health along the period of office. 4) There was the significant difference among the groups for the degree of life satisfaction in the category of work, leisure and health, but no relation along the pay. 5) There was the significant difference among the groups for the degree of life satisfaction in the 4 categories along the university. 2. There was no significant difference among the groups for the degree of life satisfaction in along the type of work. 3. There was the significant difference among the groups for the degree of life satisfaction in the category of relation, leisure and health but, no work along the type of an association of like-minded persons.