Fracture prediction device for spot welded portion, method of the same, software arrangement, and computer-accessible medium

A fracture prediction device provided for a spot welded portion, comprising:

• an input arrangement configured to input at least one of a tensile strength (TS) of a material, a plate thickness t, a nugget diameter d of a spot welding, a plate width w of a particular joint, or a rotation angle θ of the joint plates in a tension testing procedure which is at least one of a cross tension testing procedure or a shear tension testing procedure at a spot welded joint;
• a first calculation arrangement configured to determine a fracture limit load (Fcts) as a fracture strength parameter of the spot welded portion in a cross tension, using a formula (a), and a fracture limit load (Ftss) as a fracture strength parameter of the spot welded portion in a shear tension using a formula (b), based on a stress concentration factor α and at least one of the inputted tensile strength TS of the material, the plate thickness t, the nugget diameter d of the spot welding, the plate width w of the joint, or the rotation angle θ of the particular joint in the tension testing procedure, wherein the stress concentration factor α is at least one of (i) defined by a formula of (TS) / (mean tensile stress σo) or (ii) calculated using a stress concentration factor calculation formula, and wherein
• Fcts=2TSWt sin θ/α (a)
• Ftss=TSWt/α (b);
• a parameter storage arrangement configured to store the fracture strength parameter by each steel type;
• and
• a second calculation arrangement configured to analyze a fracture of the spot welded portion by providing the fracture strength parameter stored in the parameter storage arrangement into a fracture limit line in which a deformation at a periphery of the spot welding portion is modeled by a finite element procedure,
• wherein the fracture limit line is created as a curve based on a shear force and a vertical force with respect to the spot welded portion.

A fracture prediction method provided for a spot welded portion, comprising:

• inputting at least one of a tensile strength (TS) of a material, a plate thickness t, a nugget diameter d of a spot welding, a plate width w of a particular joint, or a rotation angle θ of the particular joint in a tension test which is at least one of a cross tension testing procedure or a shear tension testing procedure at a spot welded joint;
• determining a fracture limit load (Fcts) as a fracture strength parameter of the spot welded portion in a cross tension using a formula (a), and a fracture limit load (Ftss) as a fracture strength parameter of the spot welded portion in a shear tension using a formula (b), based on a stress concentration factor α and at least one of the inputted tensile strength TS of the material, the plate thickness t, the nugget diameter d of the spot welding, the plate width w of the joint, or the rotation angleθ of the joint in the tension testing procedure, wherein the stress concentration factor α is at least one of (i) defined by a formula of ( TS)/(mean tensile stress σo) or (ii) calculated using a stress concentration factor calculation formula, and wherein
• Fcts=2TSWt sin θ/α (a)
• Ftss=TSWt/α (b);
• storing the fracture strength parameter by each steel type in a parameter storage arrangement;
• and
• analyzing a fracture of the spot welded portion by providing the fracture strength parameter stored in the parameter storage arrangement into a fracture prediction formula in which a deformation at a periphery of the spot welding portion is modeled by a finite element procedure,
• wherein the fracture prediction formula is based on a shear force and a vertical force with respect to the spot welded portion.

A fracture prediction method for a spot welded portion, comprising:

• inputting at least one of a tensile strength (TS) a material, a plate thickness t, a nugget diameter d of a spot welding, a plate width w of a particular joint, or a rotation angle θ of the particular joint in a tension test which is at least one of a cross tension testing procedure or a shear tension testing procedure at a spot welded joint;
• determining a fracture limit load (Fcts) as a fracture strength parameter of the spot welded portion in a cross tension using a formula (a) and a fracture limit load (Ftss) as a fracture strength parameter of the spot welded portion in a shear tension using a formula (b), based on a stress concentration factor α and at least one of the inputted tensile strength TS of the material, the plate thickness t, the nugget diameter d of the spot welding, the plate width w of the joint, or the rotation angle θ of the joint in the tension testing procedure, wherein the stress concentration factor α is at least one of (i) defined by a formula of (TS) / (mean tensile stress σo) or (ii) calculated using a stress concentration factor calculation formula, and wherein
• Fcts=2TSWt sin θ/α (a)
• Ftss=TSWt/α (b);
• storing the fracture strength parameter by each steel type in a parameter storage arrangement;
• and
• analyzing a fracture of the spot welded portion by providing the fracture strength parameter stored in the parameter storage arrangement into a fracture limit line in which a deformation at a periphery of the spot welding portion is modeled by a finite element procedure,
• wherein the fracture limit line is created as a curve based on a shear force and a vertical force with respect to the spot welded portion.

A non-transitory computer storage arrangement provided for a fracture prediction of a spot welded portion to design a circuit, comprising:

• a first set of instructions which, when executed by a processing arrangement, configure the processing arrangement to determine a fracture limit load (Fcts) as a fracture strength parameter of the spot welded portion in a cross tension using a formula (a), and a fracture limit load (Ftss) as a fracture strength parameter of the spot welded portion in a shear tension using a formula (b), based on a stress concentration factor α and at least one of a tensile strength (TS) of a material, a plate thickness t, a nugget diameter d of a spot welding, a plate width w of a particular joint, and a rotation angle θ of the particular joint in a tension testing procedure based on at least one of a cross tension testing procedure or a shear tension testing procedure at a spot welded joint, wherein the stress concentration factor α is at least one of (i) defined by a formula of (TS)/(mean tensile stress σo) or (ii) calculated using a stress concentration factor calculation formula, and wherein
• Fcts=2TSWt sin θ/α (a)
• Ftss=TSWt/α (b);
• a second set of instructions which, when executed by the processing arrangement, configure the processing arrangement to store the fracture strength parameter by each steel type in a parameter storage arrangement;
• and
• a third set of instructions which, when executed by the processing arrangement, configure the processing arrangement to analyze a fracture of the spot welded portion by providing the fracture strength parameter stored in the parameter storage arrangement into a fracture prediction formula in which a deformation at a periphery of the spot welding portion is modeled by a finite element procedure,
• wherein the fracture prediction formula is based on a shear force and a vertical force with respect to the spot welded portion.

A non-transitory computer storage arrangement provided for a fracture prediction of a spot welded portion to design a circuit, comprising:

• a first set of instructions which, when executed by a processing arrangement, configure the processing arrangement to determine a fracture limit load (Fcts) as a fracture strength parameter of the spot welded portion in a cross tension using a formula (a) and a fracture limit load (Ftss) as a fracture strength parameter of the spot welded portion in a shear tension using a formula (b), based on a stress concentration factor α and at least one of a tensile strength (TS) of a material, a plate thickness t, a nugget diameter d of a spot welding, a plate width w of a particular joint, and a rotation angle θ of the particular joint in a tension testing procedure based on at least one of a cross tension testing procedure or a shear tension testing procedure at a spot welded joint, wherein the stress concentration factor α is at least one of (i) defined by a formula of (TS) / (mean tensile stress σo) or (ii) calculated using a stress concentration factor calculation formula, and wherein
• Fcts=2TSWt sin θ/α (a)
• Ftss=TSWt/α (b);
• a second set of instructions which, when executed by the processing arrangement, configure the processing arrangement to store the fracture strength parameter by each steel type in a parameter storage arrangement;
• and
• a third set of instructions which, when executed by the processing arrangement, configure the processing arrangement to analyze a fracture of the spot welded portion by providing the fracture strength parameter stored in the parameter storage arrangement into a fracture limit line in which a deformation at a periphery of the spot welding portion is modeled by a finite element procedure,
• wherein the fracture limit line is created as a curve based on a shear force and a vertical force with respect to the spot welded portion.

A non-transitory computer-accessible medium including a computer program thereon which, when executed by a processing arrangement, configures the processing arrangement to perform the procedures comprising:

• determining a fracture limit load (Fcts) as a fracture strength parameter of a spot welded portion in a cross tension using a formula (a), and a fracture limit load (Ftss) as a fracture strength parameter of the spot welded portion in a shear tension using a formula (b), based on a stress concentration factor α and at least one of a tensile strength (TS) of a material, a plate thickness t, a nugget diameter d of a spot welding, a plate width w of a joint, and a rotation angle θ of the joint in a tension testing procedure obtained based on at least one of a cross tension testing procedure or a shear tension testing procedure at a spot welded joint, wherein the stress concentration factor α is at least one of (i) defined by a formula of ( TS)/(mean tensile stress σo) or (ii) calculated using a stress concentration factor calculation formula, and wherein
• Fcts=2TSWt sin θ/α (a)
• Ftss=TSWt/α (b);
• storing the fracture strength parameter by each steel type in a parameter storage arrangement;
• and
• analyzing a fracture of the spot welded portion by providing the fracture strength parameter stored in the parameter storage arrangement into a fracture prediction formula in which a deformation at a periphery of the spot welding portion is modeled by a finite element procedure,
• wherein the fracture prediction formula is based on a shear force and a vertical force with respect to the spot welded portion.

A non-transitory computer-accessible medium including a computer program thereon which, when executed by a processing arrangement, configures the processing arrangement to perform the procedures comprising:

• determining a fracture limit load (Fcts) as a fracture strength parameter of a spot welded portion in a cross tension using a formula (a) and a fracture limit load (Ftss) as a fracture strength parameter of the spot welded portion in a shear tension using a formula (b), based on a stress concentration factor α and least one of a tensile strength (TS) of a material, a plate thickness t, a nugget diameter d of a spot welding, a plate width w of a joint, and a rotation angle θ of the joint in a tension testing procedure obtained based on a cross tension testing procedure or a shear tension testing procedure at a spot welded joint, wherein the stress concentration factor α is at least one of (i) defined by a formula of (TS) / (mean tensile stress σo) or (ii) calculated using a stress concentration factor calculation formula, and wherein
• Fcts=2TSWt sin θ/α (a)
• Ftss=TSWt/α (b);
• storing the fracture strength parameter by each steel type in a parameter storage arrangement;
• and
• analyzing a fracture of the spot welded portion by installing the fracture strength parameter stored in the parameter storage arrangement into a fracture limit line in which a deformation at a periphery of the spot welding portion is modeled by a finite element procedure,
• wherein the fracture limit line is created as a curve based on a shear force and a vertical force with respect to the spot welded portion.