Efficient use of metallic materials for dynamic tear testing

A method for making a rectangular parallepiped integral entity to be used for the purpose of performing, in relation to an object, dynamic tear testing of the kind wherein a rectangular parallepiped specimen made of a metallic material is impacted, said specimen having a prescribed length, a prescribed width and a prescribed thickness, said specimen having provided therein a crack through said thickness and along a portion of said width for initiating fracture of said specimen when impacted, said method comprising:

• determining the extent of lengthwise plastic deformation of said specimen which would result if said specimen were subjected to said dynamic tear testing;
• obtaining from said object a rectangular parallelepiped section having said prescribed width, said prescribed thickness and a section length which is shorter than said prescribed length, said section length being at least as great as said determined extent of lengthwise plastic deformation;
• and
• joining at lengthwise opposite ends of said section a pair of congruent rectangular parallelepiped end-tabs, each said end-tab having said prescribed width, said prescribed thickness and an end-tab length which is equal to one-half the difference between said prescribed length and said section length, thereby forming said integral entity having said prescribed length, said prescribed width and said prescribed thickness, said integral entity being adaptable to being used as said specimen for said purpose.

A method for making a rectangular parallepiped integral entity to be used for the purpose of performing, in relation to an object, dynamic tear testing of the kind wherein a rectangular parallepiped specimen made of a metallic material is impacted, said specimen having a prescribed length, a prescribed width and a prescribed thickness, said specimen having provided therein a crack through said thickness and along a portion of said width for initiating fracture of said specimen when impacted, said method comprising:

• determining the extent of lengthwise plastic deformation of said specimen which would result if said specimen were subjected to said dynamic tear testing;
• obtaining from said object a rectangular parallelepiped section having said prescribed width, said prescribed thickness and a section length which is shorter than said prescribed length, said section length being at least as great as said determined extent of lengthwise plastic deformation;
• and
• joining at lengthwise opposite ends of said section a pair of congruent rectangular parallelepiped end-tabs, each said end-tab having said prescribed width, said prescribed thickness and an end-tab length which is equal to one-half the difference between said prescribed length and said section length, thereby forming said integral entity having said prescribed length, said prescribed width and said prescribed thickness, said integral entity being adaptable to being used as said specimen for said purpose;
• wherein said determining the extent includes at least one of the following:
• (a) referring to data pertaining to the extent of lengthwise plastic deformation which would result when an exemplary said specimen made of the same metallic material of which said object is made were subjected to said dynamic tear testing;
• (b) referring to data pertaining to the extent of lengthwise plastic deformation which would result when an exemplary said specimen made of a metallic material belonging to same subcategory of the same category of metallic material of which said object is made were subjected to said dynamic tear testing;
• (c) subjecting to said dynamic tear testing an exemplary specimen which is made of the same metallic material of which said object is made, and measuring the extent of lengthwise plastic deformation of said exemplary specimen;
• and
• (d) formulating data pertaining to the extent of lengthwise plastic deformation which would result when exemplary specimens made of metallic materials belonging to at least one subcategory of the same category of metallic material of which said object is made were subjected to said dynamic tear testing, said formulating data including subjecting to said dynamic tear testing at least one said exemplary specimen, wherein at least one said exemplary specimen belongs to the same subcategory of the same category of metallic material of which said object is made, and measuring the extent of lengthwise plastic deformation of each said exemplary specimen.

A method for performing, in relation to an object, dynamic tear testing of the kind wherein a rectangular parallepiped specimen made of a metallic material is impacted, said specimen having a prescribed length, a prescribed width and a prescribed thickness, said specimen having provided therein a crack through said thickness and along a portion of said width for initiating fracture of said specimen when an impact is caused with respect thereto, said method comprising:

• determining the extent of lengthwise plastic deformation of said specimen which would result if said specimen were subjected to said dynamic tear testing;
• obtaining from said object a rectangular parallelepiped section having said prescribed width, said prescribed thickness and a section length which is shorter than said prescribed length, said section length being at least as great as said determined extent of lengthwise plastic deformation;
• joining at lengthwise opposite ends of said section a pair of congruent rectangular parallelepiped end-tabs, each said end-tab having said prescribed width, said prescribed thickness and an end-tab length which is equal to one-half the difference between said prescribed length and said section length, thereby forming said integral entity having said prescribed length, said prescribed width and said prescribed thickness, said integral entity being adaptable to being used as said specimen for said performing of said dynamic tear testing;
• providing said crack in said integral entity;
• and
• causing said impact with respect to said integral entity.

A method for performing, in relation to an object, dynamic tear testing of the kind wherein a rectangular parallepiped specimen made of a metallic material is impacted, said specimen having a prescribed length, a prescribed width and a prescribed thickness, said specimen having provided therein a crack through said thickness and along a portion of said width for initiating fracture of said specimen when an impact is caused with respect thereto, said method comprising:

• determining the extent of lengthwise plastic deformation of said specimen which would result if said specimen were subjected to said dynamic tear testing;
• obtaining from said object a rectangular parallelepiped section having said prescribed width, said prescribed thickness and a section length which is shorter than said prescribed length, said section length being at least as great as said determined extent of lengthwise plastic deformation;
• joining at lengthwise opposite ends of said section a pair of congruent rectangular parallelepiped end-tabs, each said end-tab having said prescribed width, said prescribed thickness and an end-tab length which is equal to one-half the difference between said prescribed length and said section length, thereby forming said integral entity having said prescribed length, said prescribed width and said prescribed thickness, said integral entity being adaptable to being used as said specimen for said performing of said dynamic tear testing;
• providing said crack in said integral entity;
• and
• causing said impact with respect to said integral entity;
• wherein said determining the extent includes at least one of the following:
• (a) referring to data pertaining to the extent of lengthwise plastic deformation which would result when an exemplary said specimen made of the same metallic material of which said object is made were subjected to said dynamic tear testing;
• (b) referring to data pertaining to the extent of lengthwise plastic deformation which would result when an exemplary said specimen made of a metallic material belonging to same subcategory of the same category of metallic material of which said object is made were subjected to said dynamic tear testing;
• (c) subjecting to said dynamic tear testing an exemplary specimen which is made of the same metallic material of which said object is made, and measuring the extent of lengthwise plastic deformation of said exemplary specimen;
• and
• (d) formulating data pertaining to the extent of lengthwise plastic deformation which would result when exemplary specimens made of metallic materials belonging to at least one subcategory of the same category of metallic material of which said object is made were subjected to said dynamic tear testing, said formulating data including subjecting to said dynamic tear testing at least one said exemplary specimen, wherein at least one said exemplary specimen belongs to the same subcategory of the same category of metallic material of which said object is made, and measuring the extent of lengthwise plastic deformation of each said exemplary specimen.