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now i am looking for the stress [tex]\sigma[/tex] for the aluminium and for the steel

i would want to say simply [tex]\sigma[/tex]=F/A but i need to somehow take into account the types of materials and their elasticity,

i think that hookes law could help me here but i dont know the strains

also how do i take the volume into account? the only equation i have for volume is [tex]\Delta[/tex]=[tex]\epsilon[/tex]x + [tex]\epsilon[/tex]y + [tex]\epsilon[/tex]z, but i doubt thats going to help