# fracture toughness

## Plastic J significance in CTOD equation

I am working on the validation of CTOD.

In the evaluation of CTOD using the
J-integral approach as applied in ASTM E1290 and E1820, the plastic J
component is defined as (Npl*Apl)/(Bn*Bo)
Npl=dimensionless constant(plasticity)
Apl=area under load vs. displacement plot
Bn=ligamen length (W-a)
Bo=section thickness

On E1820 there are different functions provided for Npl if Apl is
evaluated differently (CMOD or load-line displacement).

## Fracture toughness of cast aluminum A383-T5

Hi All,

Does anybody know where I can get the fracture toughness of cast Aluminum A383-T5? Any standard?

Thanks,

Nasib

## How to plot Fracture toughness vs Crack length in Abaqus for Delamination problem

I've modelled a DCB specimen and applied Boundary conditions and load... I followed the same procedures given in abaqus documentation... As expected the crack initiates and propagates along the interface... I can get the Resultant force vs displacement plot from the analysis.. But i dont know how to plot the fracture toughness vs crack length plot in ABAQUS..

## Tensile testing curve and fracture toughness relation

Hello everyone,
I am studying fracture of polymer composites.
I had a question I want to relate fracture toughness of composite to the composite stress-strain curve found from simple tensin test(on samples with no notch or pre-existing crack), can anyone give me a hint , how to do it?

## puzzle in the asymmetric four-point-bend sepcimens.

HI, everyone,

This is pflines, i am working on the mode I\II fracture toughness.

i want to use the asymmetric four-point-bend sepcimens to get the value of KI and KII,

but did not found a clear formulation to caculate the KI and KII,

anyone could help me?