{'fraction_non_alphanumeric': 0.01293103448275862, 'fraction_numerical': 0.0, 'mean_word_length': 5.683453237410072, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Experimental Research on the Stiffness of Hyperboloid Shallow Shell

Stiffness is a very important property of automobile panel, especially for high-strength thinning sheet due to personnel security and energy conservation on auto industry. It is difficult to study because of the complexity streamline feature of auto body. An experiment method for determining stiffness was presented. The experiment study models of which based on the hyperboloid shallow shells that could represent automobile panel’s surface features was established. The criterion and research technique of automobile panel stiffness were introduced. The experiment research works of effects of two main process conditions on stiffness which blank holding force (BHF) and boundary condition during the stiffness test were obtained. All conclusions provided a particularly effective process guidance and technical approach in the automobile panel production.