The classic approximate formula proposed by Creager and Paris is generally used to calculate the opening stress of three-point bending U-notched beams along the bisector, but the scope of application is very limited.

Experimental study on fracture parameters of three-point bending beam based on smart properties of CFRC;

Based on the assumption that the rotation point of the notched three-point bending beam under loading is the tip of effective fictitious crack,a new formula for calculating the fracture energy of concrete according to the measured relationship between load and crack-mouth opening displacement(CMOD) of three-point bending beam is proposed.

The three-point bending beam fracture test for cement paste and mortar specimens with different strengths,dimensions and initial crack-depth ratios was carried out.

The paper also studies the function of CFRC in three point bending beam.

Study on spring back of U-shaped bending of aluminum alloy sheet;

Effect of blankholder pressure on the spring-back in U-shaped bending of sheet material;

The influence of process parameters on shape of product and forming load of U-bending;

Experimental Study the Rebound of Wide Sheet U-bending without Edge Pressure;

Bye the instance of the U-bending,this paper analyses how the construction of the bending die will impact the surface finish of the bending part,proposes some construction of the U-bending die for improving the surface finish of the bending part.

However,a sharp crack can hardly be prepared for the specimen of quasi-brittle materials,alternatively it is reasonable to consider a U-shaped notch,then use stress concentration factor(SCF) to characterize the peak stress at the notch bottom.