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As soon as the distal end of the rod touched the top portion of the upper metallic sheet , an axial force was applied .
 material: As; material: as; machine or equipment: rod; material: metallic sheet; concept or principle: axial force
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 material: As; material: as; machine or equipment: rod; material: metallic sheet; concept or principle: axial force