Visualization of impact force by using pressure sensitive paper
Ogawa Kinya
Abstract:To characterize damage and deformation in an impacted area of structure caused by flying foreign objects, it is fundamentally needed to measure the acting force and its distribution over the area. In the present experiments, it was attempted to identify visually the impact force using the pressure sensitive paper 'Prescale'. A split Hopkinson pressure bar method was used to evaluate the sensitivity of the paper under impact loading. It is found that the pressure sensitive paper instantaneously responds even for the impact loading of which duration is several hundred microseconds, while the sensitivity is significantly reduced when compared to the quasi static loading. Hertzian impact tests were tried to visually evaluate pressure distributions using the pressure sensitive paper, and the experimental results were discussed. Key Words:visualization, impact force, pressure sensitive paper, split-Hopkinson bar, duration of impact