DEFINITION

Cordinate System ( x , y , z ) or ----right hand tria Displacement (u , v , w ) or Stress = Linear , stress vector (force / area) T Stress vector = Force / Area with outward drawn normal Similarly for other plane Infinite plane exist at a point P Infinite vectors Plane/ Area is defined by outward drawn normal. Infinite planes 3 – mutually outward drawn planes at point P (x1, x2 , x3,) Planes at P Stress vector State of stress at a point State of stress at a point = Hypothesis Body is continuous and remain continuous under the action of external forces - (H1) Elastic Continuum Neighbor remain neighbor under external force No cracks /gaps or voids (H2) There exists a unique unstressed state of the solid body to which the body returns whenever all the external forces are removed. (H3) Principle of super position holds good