CN105043876B

CN105043876B - Bilinearity split the law determines the experimental rig of quasi-brittle material tensile strength

Info

Publication number: CN105043876B
Application number: CN201510526330.9A
Authority: CN
Inventors: 张江涛; 周志祥; 蒋彦涛
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-08-25
Filing date: 2015-08-25
Publication date: 2018-02-16
Anticipated expiration: 2035-08-25
Also published as: CN105043876A

Abstract

The invention discloses a kind of experimental rig of bilinearity split the law measure quasi-brittle material tensile strength, including it is respectively in two hump loading heads for being used to apply rectangular coupon load of both sides above and below rectangular coupon；The experimental rig of the bilinearity split the law measure quasi-brittle material tensile strength of the present invention, the measurement error for avoiding traditional split the law from being brought by cylinder or disk test specimen machining accuracy, stable tension can be obtained, the ultimate tensile strength of test specimen can be accurately obtained, improves cleavage strength results precision.

Description

Bilinearity split the law determines the experimental rig of quasi-brittle material tensile strength

Technical field

The invention discloses a kind of experimental rig, more particularly to one kind to be used to test the quasi-brittle materials such as concrete or rock The experimental rig of tensile strength.

Background technology

The tensile strength for determining the quasi-brittle materials such as concrete, rock by test method has uniaxial direct tensile method, split the law (including cylinder split the law and Brazilian disc method).It is former according to Elasticity after test specimen is by a pair of splitting Concentrated loads Reason is producing uniform tension on loading direction, and corresponding load can be scaled material when being split into two by component The tensile strength of material；Uniaxial direct tensile method can not accurately obtain structure because alignment deviation problem make it that measured data discreteness is very big True tension in part；Split the law is currently used assay method more using cylinder or disc structure, but in diametral compression test Because the making precision and local stress of cylinder or disk, which may cause load(ing) point first to ftracture, causes result of the test and theoretical value not Identical phenomenon, result of the test is influenceed very big.

The content of the invention

In view of this, it is an object of the invention to provide a kind of examination of bilinearity split the law measure quasi-brittle material tensile strength Experiment device, the measurement error for avoiding traditional split the law from being brought by cylinder or disk test specimen machining accuracy, stabilization can be obtained Tension, the ultimate tensile strength of test specimen can be accurately obtained, improve cleavage strength results precision.

The experimental rig of the bilinearity split the law measure quasi-brittle material tensile strength of the present invention, including it is respectively in rectangle examination Both sides are used for two hump loading heads for applying load to rectangular coupon to part up and down.

Further, the hump face of two hump loading heads is set.

Further, in addition to the positioning screw that is connected between two hump loading heads；It is corresponding fixed on two hump loading heads Position screw rod is provided with engaging lug.

Further, the hump face of the hump loading head is wavy surface structure.

Further, the plane of symmetry of the positioning screw along two humps of hump loading head is set.

Further, the distance between two humps of the hump loading head are 0.28H, and wherein H is that rectangular coupon edge adds Carry the size in direction.

The beneficial effects of the invention are as follows：The experiment dress of the bilinearity split the law measure quasi-brittle material tensile strength of the present invention Put, the measurement error for avoiding traditional split the law from being brought by cylinder or disk test specimen machining accuracy, can obtain stable drawing should Power, the ultimate tensile strength of test specimen can be accurately obtained, improve cleavage strength results precision.

Brief description of the drawings

Fig. 1 is the structural representation of the present invention；

Fig. 2 is Fig. 1 left view.

Embodiment

Fig. 1 is the structural representation of the present invention；Fig. 2 is Fig. 1 left view, as shown in the figure：The bilinearity of the present embodiment is split The experimental rig of method measure quasi-brittle material tensile strength is split, including is respectively in rectangular coupon and is used to try rectangle in both sides about 1 Part 1 applies two hump loading heads 2 of load, applies load, hump loading to rectangular coupon 1 by two hump loading heads 2 First 2 hump face is contacted with rectangular coupon 1, i.e., two pairs of concentrated forces are produced on rectangular coupon 1, passes through two pairs of concentrated forces of adjustment Spacing makes the inside of rectangular coupon 1 in the range of certain length produce Stress superposition effect, can obtain accurate ultimate tensible strength Degree, the measurement error for avoiding traditional split the law from being brought by cylinder or disk test specimen machining accuracy, improve cleavage strength experiment and survey Try precision；The hump size of hump loading head 2 cleaves canonical sized selection, but the spacing of dual hump and connection knot according to existing single line Structure size need to specially be designed according to test specimen size.

In the present embodiment, the hump face of two hump loading heads 2 is set, can produce be parallel to each other it is single at symmetrical two Line slabbing action, the inside of rectangular coupon 1 is set to produce Stress superposition effect.

In the present embodiment, in addition to the positioning screw 3 being connected between two hump loading heads 2；On two hump loading heads 2 Corresponding positioning screw 3 is provided with engaging lug 4, it is ensured that two close alignments in vertical height of hump loading head 2, positioning screw 3 are Two and the two sides of two hump loading heads 2 are respectively in, positioning screw 3 is threadably secured on a hump loading head 2 Engaging lug 4 and be slidably matched with the engaging lug 4 on another hump loading head 2.

In the present embodiment, the hump face of the hump loading head 2 is wavy surface structure, can make the hump of hump loading head 2 With linear contact lay between rectangular coupon 1, cleavage loading is formed.

In the present embodiment, the plane of symmetry of the positioning screw 3 along two humps of hump loading head 2 is set, therefore is positioned Screw rod 3 is equal to the distance between two humps of hump loading head 2, it is ensured that the in the vertical direction alignment of splitting load.

In the present embodiment, the distance between two humps of the hump loading head 2 are 0.28H, and wherein H is rectangular coupon 1 along loading direction size.Under two groups of splitting load actions in bilinearity split the law, cleaved in the eminence horizontal direction of test specimen half Reduce at load action line with tension caused by two groups of splitting load action line centers with the increase of spacing, but both Ratio then presented with the increase of spacing and first increase the trend that reduces afterwards, when the distance between two humps of hump loading head 2 For 0.28H when, both ratio reaches maximum, stress difference about 14.8%.Now, the ratio of compression chord and tension stress is 3.3, tensile failure would generally occur for test specimen, and therefore, the optimal spacing that cleavage fracture occurs is 0.28H.

Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to compared with The present invention is described in detail good embodiment, it will be understood by those within the art that, can be to the skill of the present invention Art scheme is modified or equivalent substitution, and without departing from the objective and scope of technical solution of the present invention, it all should cover at this Among the right of invention.

Claims

A kind of 1. experimental rig of bilinearity split the law measure quasi-brittle material tensile strength, it is characterised in that：Including being respectively in Two hump loading heads for being used to apply rectangular coupon load of both sides above and below rectangular coupon；The hump of the hump loading head Face is wavy surface structure.
2. the experimental rig of bilinearity split the law measure quasi-brittle material tensile strength according to claim 1, its feature It is：The hump face of two hump loading heads is set.
3. the experimental rig of bilinearity split the law measure quasi-brittle material tensile strength according to claim 1, its feature It is：Also include the positioning screw being connected between two hump loading heads；Positioning screw is corresponded on two hump loading heads to be provided with Engaging lug.
4. the experimental rig of bilinearity split the law measure quasi-brittle material tensile strength according to claim 3, its feature It is：The plane of symmetry of the positioning screw along two humps of hump loading head is set.
5. the experimental rig of bilinearity split the law measure quasi-brittle material tensile strength according to claim 1, its feature It is：The distance between two humps of the hump loading head are 0.28H, and wherein H is chi of the rectangular coupon along loading direction It is very little.