ANALYSIS OFSTRESSAND STRAIN 2 State of stress at a point There are countless sections through a point. The gathering of stresses in all sections is called the state of stress at this point 3. Element: O Element-- Delegate of a point in the member. It is a infinitesimal geometric body enveloping the studied point In common use it is a correctitude cubic 2 Properties of an element-a Stresses are distributed uniformly in the sections b, The stresses in two planes that are Ox parallel to each other are equal 4 Expression ofstressesin general case4、Expression of stresses in general case 3、Element：Element—Delegate of a point in the member. It is a infinitesimal geometric body enveloping the studied point. In common use it is a correctitude cubic body. Properties of an element—a、Stresses are distributed uniformly in the sections； b、The stresses in two planes that are parallel to each other are equal. 2、State of stress at a point： There are countless sections through a point. The gathering of stresses in all sections is called the state of stress at this point. x y z sx sz s y txy