Abstract
Gas detonation forming is an unconventional technique, which has the potential to form complex geometries, including sharp angles and undercuts in a very short process time. To date, most of the numerical studies on detonation forming neglect the highly dynamic pressure profile of the detonation obtained from experiments. In the present work, it is emphasised that the consideration of the actual detonation pressure as measured in the experiment is crucial. The thickness distribution and radial strain are studied using a strain-rate dependent Johnson-Cook material model. The obtained results vary significantly with change in loading rate. Moreover, the model is capable of predicting extremely sharp edges.
Highlights
Gas detonation forming is a high-speed forming method that uses pressure energy of a shock wave, produced as a result of the detonation of a mixture of gases like Oxygen (O2) and Hydrogen (H2) [1]
Wijayathunga and Webb [6] developed a finite element model to simulate the experimental tests for the impulsive deep drawing of a brass square cup with the presence of a soft lead plug
T = 0 μs t = 24 μs t = 30 μs t = 36 μs t = 42 μs t = 48 μs t = 51 μs t = 68 μs Figure 4A shows the variation of the thickness with respect to the initial radius for different loading rates
Summary
Gas detonation forming is a high-speed forming method that uses pressure energy of a shock wave, produced as a result of the detonation of a mixture of gases like Oxygen (O2) and Hydrogen (H2) [1]. This forming process has many well-known advantages, e. Yasar et al conducted both experimental and numerical investigations of aluminium cup drawing using gas detonation process [3, 4]. Due to sensing limitations and in order to reduce computational cost, in Yasar et al works, simulations were carried out with linearly increasing and decreasing load over the forming process duration (triangular loading) [3, 4]. The Johnson-Cook plasticity material model is used to study strain-rate sensitivity
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