Mai Lan NGUYEN's blog

Anyone know the Garwood method which is used to determine the fracture energy of concrete (composite materials)?

Garwood method: with a load - load line displacement curve of an three point bending fracture test (or SENB), we have firstly:

J₀=2U_0/B(H-a₀)

After, an iterative relation is used:

J_n=J_n-1(H-a_n)/(H-a_n-1)+2U_n/B(H-a_n-1)

B,H : width and height of the beam respectively.

a : crack length 

Hi everyone,

Anyone can tell me how to determine the fracture energy for crack propagation in a 4 points bending notched beam (mode I)?