The stress variation in the area of the stress raiser
is shown in Fig.
The sharp corner on the casting is a stress raiser
that cracked on machining.
According to Griffith's theory brittle materials comprise minor cracks and defects.21 These defects perform as stress raisers
, cumulating the localized stresses around sharp edges.
c) Reducing stress raisers
by eliminating contamination and preventing damage caused during mounting will minimise the risk of surface distress.
* Minimize stress points by eliminating stress raisers
, kinks, mold seams, knit lines and other break points.
The cracks act as stress raisers
, causing stress concentration that inhibits the comprehensive deformation mechanisms in PC.
The resilient middle layer absorbs the bending force, reducing stress raisers
, which can break the outer layer, ensuring the anti-corrosion inner layer is well protected (Figure 5).
"Get rid of the chip breaking bumps or grooves, and you get rid of a lot of stress raisers
that can cause the edges to break off."
* Solution Accuracy: Improved mesh quality around critical boundaries and stress raisers
with a new quadrilateral element meshing option.
The nominal stress that can be resisted under cyclic loading is determined by considering mean stresses and by making adjustments for the effects of stress raisers
. The strain-based approach involves more detailed analysis of the localized yielding that may occur at stress raisers
during cyclic loading.
If excessive needle-like inclusions are left, they can initiate cracks by serving as stress raisers
On medium volume batch production, this new process gives the cores a 2mm Ra (roughness average) finish that translates to an even finer surface inside the cast components: It is proving ideal for casting galleries in aluminium pistons of diesel engines, where a fault-free surface is needed to eliminate stress raisers
and a smooth precision shape is required for efficient oil flow.