Problems with tensile failure stress

- November 7, 2023 at 2:30 pm
  
  Jorge Riquelme
  Subscriber
  
  Hello, I am having problems with my modeling of a reinforced concrete beam. Enter the properties of steel and concrete, which are modulus of elasticity, Poisson's ratio, density, stress-strain curve, and for concrete, enter tensile pressure failure, which is -3.19 MPa . Load the model but it generates concrete failure with a normal stress of 9.493 Mpa. I don't understand why the failure effort is greater than the entry effort. I tried different meshes and the result does not change. Can you help me. I would be very grateful since it is for my undergraduate thesis.
  Below we attach photos of the model for a better understanding of the problem.
- November 13, 2023 at 9:57 pm
  
  Chris Quan
  Ansys Employee
  
  Please be aware that Tensile Pressure Fialure is not Tensile Stress Failure. It is the Failure by Pressure. The negative sign means the negative pressure, which is Tensile Pressure.
  See Section 11.11.5 of Mechanical Applications in ANSYS Help at https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v232/en/exd_ag/ds_ex_mat_tenpressf.html?q=pressure
  Pressure is Hydrostatic Pressure, which is euqal to the sum of three principal stresses divided by 3.
  If the material in an element is in tension, it is likely that its Pressure is negative. When the negative pressure has reached the pre-defined value, the material in the element fails.
  The tensile stress in the element is not necessarily equal to the Tensile Pressure.