자동차용 강판 동적인장물성 측정에서의 표준불확도평가

다국어 초록 (Multilingual Abstract)

The crashworthiness of auto?body structures is one of the important issues in the automotive industry. The crash analysis with finite element methods has been conducted in order to evaluate the crashworthiness of auto?body structures. In the car crash, auto?body structures undergo deformation with a wide range of strain rate from 0.001/sec to 500/sec. Since the material properties of steel sheets depend on the rate of deformation, in order to ensure the impact characteristics of auto?body structures accurately, the dynamic behavior of sheet metals must be examined and applied to the finite element model appropriately. This research is concerned with standard uncertainty evaluation of tensile properties of auto-body steel sheets in wide range of strain rate from 0.001/sec to 100/sec. Stress-strain relations of an auto-body steel sheet were obtained with quasistatic and high speed tensile tests. Uncertainty components in both testing methods are summarized and standard uncertainties of each input quantities are evaluated. An analytic model is established in order to calculate combined standard uncertainty of the measurand. The measurand is true stress with respect to true strain and the input quantities are load and displacement data during the tensile test and initial dimensions of specimen such as thickness, width and length. Uncertainties which come from signal processing and deviation of measured values in repetitive tests are also considered.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 동적인장물성 불확도평가 절차
• 3. 자동차용강판의 동적인장물성 표준불확도평가
• 4. 결론
• References