A Study on Automatic Design of Reinforced Concrete Structures with Personal Computers

本 論文은 準備計算, 構造解析, 部材設計로 이루어지는 鐵筋콘크리트 構造設計 過程을 퍼스널 컴퓨터를 利用하여 電算化하였다. 構造解析 方法은 컴퓨터 容量, 入力資料量等을 爲해 平面骨組에 對한 直剛性度法을 使用하였고 部材設計는 슬라브, 보, 기둥, 獨立基礎를 韓國 鐵筋콘크리트 規準에 맞도록 設計하였다. 主 프로그램과 資料處理 補助프로그램의 活用으로 여러 骨組와 荷重狀態에 對한 代案檢討가 容易하게 되었다.This paper proposes a personal computer program for the automation of the RC structural design process which consists of the preparatory calculation, the structural analysis and the member design. The direct stiffness method for plane frame is used for the reason of the computer capacity limit and the efficiency of data handling. Slabs, girders, columns and isolated spread footings are designed in accordance with the Korean Standard Building Code for RC. This program, with the aid of the subsidiary program for data handling, facilitates the process of reviewing alternatives and decision making.This paper proposes a personal computer program for the automation of the RC structural design process which consists of the preparatory calculation, the structural analysis and the member design. The direct stiffness method for plane frame is used for the reason of the computer capacity limit and the efficiency of data handling. Slabs, girders, columns and isolated spread footings are designed in accordance with the Korean Standard Building Code for RC. This program, with the aid of the subsidiary program for data handling, facilitates the process of reviewing alternatives and decision making

A study on the effects of a coating treatment on the high temperature mechanical properties and microstructure in a nickel-base superalloy

학위논문(박사) - 한국과학기술원 : 재료공학과, 1986.8, [ [vi], 153 p. ]한국과학기술원 : 재료공학과

Effect of Intermediate Annealing on the Plastic Anistropy in Al-6 wt%Mg Alloy Sheets for Automobile Application

The effects of intermediate annealing on the plastic anisotropy were investigated in Al-6 wt%Mg alloy sheets for automobile application. Intermediate annealing was adopted to improve the formability in Al-Mg alloys. For two different conditions of O and T4 treatment, textures were analyzed by using orientation distribution function method. The plastic anisotropy properties were evaluated by measuring R values, and then compared them with caculated R values from quantitative texture data. The stretch forming properties were also evaluated by using work hardening exponents. Intermediate annealing decreased the deformation textures, which had an influence on the development of recrystallization textures during final heat treatment. Isotropy and stretch forming properties were decreased in the axis of 45˚ to rolling direction for O treatment due to highly remained deformation textures. Whereas anisotropy and stretch forming properties were increased in the axis of 45˚ to rolling direction for T4 treatment due to well-developed recrystallization textures of rotated cube along normal direction

Study on the Fracture Elongation of the Steel Sheet at the Intermediate Strain Rate

While the formability is important and indispensable for success in very complicated sheet metal forming, it seems that few studies has been carried out about the formability of sheet metal at the high strain rate. The present experimental results report that the elongation is dependent on the crosshead speed in tensile tests. In this paper, the tensile elongation has been obtained from various steel sheets for an auto-body at the intermediate strain rate. The strain rate in the experiment is ranged from 0.003/sec to 200/sec. The experimental result demonstrates that the tensile elongation does not decrease as the strain rate increases. This tendency has varieties depending on the microstructure and forming history of sheet metal. Some high strength steels have the tendency that the tensile elongation increases as the strain rate increases, while others not. This phenomenon is very important not only in sheet metal forming but also in the crash worthiness evaluation to predict the fracture and tearing of sheet metal members

Al 합금재 소경 주조봉 제조 및 가공 기술 개발 (C2342)

funder : 산업자원부직경이 25~120mm의 알루미늄 합금 소경봉을 Hot Top 방식의 수직 주조에 의해 제조하며, Hot Top 방식을 채용한 주조기의 설계 및 제작 기술을 습득하고 운용기술을 확립하고자 하였다. 표면의 결함을 극소화시킨 양질의 소경봉을 제조하는 주조 조건을 찾아내고, 제조한 소경봉을 사용하여 각종 제조 공정(열간 단조, 냉간 단조)으로 시제품(자동차용 부품등)을 제작하고, 그 물성을 평가하였다. 또한 수평 주조기를 설계하였고 현재 제작중이다.본 연구의 주요 내용 및 범위는 아래와 같다. 1) 수직 주조기 설계 및 제작 기술 습득 - 주조의 핵심부위인 Mold의 설계 및 가공 2) 소경봉 주조 조건 확립 - 반연속주조법으로 직경 25~120mm의 Al합금(A6061, A390 등) 소경봉 주조 - 최적의 용해 및 주조 조건 설정 3) 가공 기술 확립 - 열간 단조에 의해 자동차 부품인 Swash Plate 제작 4) 소재의 물성평가 - 결정 제어를 위한 기초 실험 수행 - 소재의 특성 평가 - 소경봉 특성 평가 - 시제품 특성 평가 5) 수평 주조기 설계 및 제