US 5,193,396 AGranted

Tensile testing apparatus

AssigneeHer Majesty the Queen in right of Canada

InventorBernard P. Gorski

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Abstract

The invention relates to a device for use in the direct tensile testing of materials, in particular brittle materials, which is self-centering under eccentrically applied loads. The apparatus effectively communicates a compressive load applied thereto to a tensile load applied substantially concentrically to the pull axis of the test specimen and thus can be employed to obtain direct tensile test characteristics by utilizing devices capable of exerting compressive forces only. In one embodiment, the apparatus comprises a pair of grips for gripping the specimen which are pivotally attached at right angles to respective sleeves in a dual sleeve assembly. The sleeves are movable so as to self-center the load which is applied, thereby eliminating bending stresses associated with off-centered loading and thus providing more accurate test results.

Claims22

Dependent claims

An apparatus for use in the tensile testing of a specimen comprising:

a first grip means for gripping one end of said specimen;
a second grip means for gripping the opposite end of said specimen;
a first intermediate member having a load bearing portion;
a second intermediate member having a load bearing portion, said first and second intermediate members being disposed such that said load bearing portions are generally outwardly opposed;
first means including a first resist pin receivable within a transversely extending bore within said first grip means, said first pin being of sufficient length so as to project radially outwardly when positioned within said first grip means bore to engage pin end accommodating means provided on said first intermediate member for pivotably connecting said first grip means with said first intermediate member;
and
second means including a second resist pin receivable within a transversely extending bore within said second grip means, said second pin being of sufficient length so as to project radially outwardly when positioned within said second grip means bore to engage pin end accommodating means provided on said second intermediate member for pivotally connecting said second grip means with said second intermediate member, said first and second means being disposed substantially orthogonal to one another and substantially transversely with respect to said specimen such that a compressive load, when applied to said load bearing portions of said first and second intermediate members, is transposed to a tensile load applied to said specimen.

4 more elements

In combination with a compression device having load exerting members, an apparatus for use in the tensile testing of a specimen comprising:

a first grip means for gripping one end of said specimen;
a second grip means for gripping the opposite end of said specimen;
a first intermediate member;
a second intermediate member, said first and second intermediate members being cylindrical sleeves of differing diameters, the first being receivable generally axially within the second and having means adapted to cooperate with said load exerting members of said compression device;
first means for pivotally connecting said first grip means with said first intermediate member;
and
second means for pivotally connecting said second grip means to said second intermediate member, said first and second means being disposed substantially orthogonal to one another and substantially transversely with respect to said specimen such that a compressive load, when applied to said first and second intermediate members, is transposed to a tensile load applied to said specimen.

4 more elements

An apparatus for use in the tensile testing of a specimen comprising:

a first grip means for gripping one end of said specimen;
a second grip means for gripping the opposite end of said specimen;
an inner cylindrical member having a load bearing end;
an outer cylindrical member having a load bearing end, said inner member being receivable generally axially within said outer member such that said load bearing ends of said members are generally outwardly opposed, said first and second grip means being receivable generally axially within said inner member;
first means for pivotally connecting said first grip means to said first intermediate member at or near the end thereof opposite its load bearing end;
second means for pivotally connecting said second grip means to said second intermediate member at or near the end thereof opposite its load bearing end, said second means including diametrically opposed aperture means provided in said inner member through which said connection can be effected;
said first and second means being disposed substantially orthogonal to one another and substantially transversely with respect to said specimen such that a compressive load, when applied to said load bearing portions of said first and second intermediate members, is transposed to a tensile load applied to said specimen.

4 more elements

An apparatus for use in the tensile testing of a specimen comprising:

a first grip means for gripping one end of said specimen;
a second grip means for gripping the opposite end of said specimen;
a first intermediate member having a load bearing portion;
a second intermediate member having a load bearing portion, said first and second intermediate members being cylindrical sleeves of differing diameters, the first being receivable generally axially within the second, and further being disposed such that said load bearing portions are generally outwardly opposed;
first means for pivotally connecting said first grip means with said first intermediate member;
and
second means for pivotally connecting said second grip means with said second intermediate member, said first and second means being disposed substantially orthogonal to one another and substantially transversely with respect to said specimen such that a compressive load, when applied to said load bearing portions of said first and second intermediate members, is transposed to a tensile load applied to said specimen.

4 more elements

Dependencies are inferred from the claim text.