In this study, when manufacturing a rectangular plate with a pinhole, the following conclusions were obtained as a result of analyzing the shape characteristics of the unit cell that fills the interior of the plate and the effect of changes in the size of the pinhole on the stress concentration coefficient. 1. The stress value generated in the case of the completely empty model was 13.9 MPa, which is an 18.8% increase in stress compared to the stress value 11.7 MPa generated in the fully filled model. However, since the weight of the empty model is 43.6% lower than that of the filled model, it is believed to be very advantageous in terms of cost. 2. The stress concentration coefficient value is lowest for the solid model and highest for the hollow model at the same d/H value. In other words, you can see that the values are changing within the boxes of the solid model and hollow model. However, the grid matching model is closest to the solid model and the filling rate is as low as 33.4-9.1%, showing the most stable strength when filling empty space.

Abstract
1. 서 론
2. 모 델링 및 해석 방법
    2.1 해석 모 델
    2.2 하중 및 경계 조건
3. 해석 파라에타
    3.1 중실 및 중공 구조
    3.2 사각형 격자 충진 구조
    3.3 다각형 격자 충전 구조
4. 해석 결과 분석
    4.1. 중실 및 중공 구조
    4.2. 사각형 격자 충진 구조
    4.3. 다각형 격자 충진
    4.4. 통합분석
6. 결 론
References

• 김창규(PhD student department of mechanical system engineering, TongMyong University) | Chang-Gyu Kim Corresponding author
• 구학근(professor , department of mechanical system engineering, graduate school, TongMyong University in Busan) | Hak-Keun Ku