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Method for measuring shear strength of machinable ceramics

A technology of shear strength and ceramics, which is applied in the direction of testing material strength by applying stable shear force and testing material strength by applying stable tension/compression, which can solve the problem of stress concentration and homogeneous ceramic shear strength. Methods and other issues to achieve the effect of avoiding stress concentration, solving evaluation difficulties, and making sample preparation easy

Inactive Publication Date: 2005-03-30
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

It has been found that shear-induced failure is the main failure mechanism of this type of ceramics, but how to accurately evaluate the shear strength has not been fully resolved
Although double-notch specimens, four-point bending, and the newly developed cross-type specimens are often used to evaluate the interfacial shear strength or bond strength of layered composites, no shear strength tests for homogeneous ceramics have been performed. Feasible method, the main reason is that the fracture direction is not along the shear zone, and often produces stress concentration

Method used

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  • Method for measuring shear strength of machinable ceramics
  • Method for measuring shear strength of machinable ceramics
  • Method for measuring shear strength of machinable ceramics

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Embodiment 1

[0032] Embodiment 1: the thickness effect of pressing hole method

[0033] An advantage of the indentation shear test is that a simple laminar sample with no shape requirements can produce a range of experimental results, and the indentation shows a good shape with no crack branches. figure 2 Shown are punched samples and punched discs, marked with "A" are punched holes, marked with "B" are punched discs, figure 2 Shear failures that did not push out the disc are also shown, marked "C". The small disk "C" embedded in the sample has no obvious concavity, indicating a brittle failure with very little shear strain. Shear strength is generally considered to be a material constant, therefore, in equation (1), the ratio Pc / h of critical load to sample thickness should also be constant.

[0034] Pc=C·h h≤hc (2)

[0035] Here C is a constant. However, experiments have shown that this proportional relationship is only established when the thickness of the sample is ...

Embodiment 2

[0039] Example 2: Effect of loading rate and punch diameter

[0040] 0.24 mm thick Ti with various loading rates in the piercing shear test 3 AlC 2 The plate sample experiment, the results show that the loading rate has little effect on the experimental results. Figure 7 It is shown that the shear strength measured at various punch speeds from 0.05 mm / min to 5 mm / min is substantially at the same level. The reason may be that machinable ceramics have a slow subcritical crack growth rate, so they are not sensitive to the loading rate.

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Abstract

The method for testing shearing strength of workable ceramics includes 1). using linear cutting process to cut out thin plate samples with various thickness from large block of sintered sample, then polishing them; 2). fixing plate sample between hard steel grippers, centres of upper and lower two grippers are opposite and a through hole through which a hard column punching head can be frictionlessly passed is cut; 3) adopting general material test machine to press hole and using thin plate sample whose relative thickness h / d=0.07-0.1 to determine shearing strength of ternary layer workale ceramics; and 4). using critical load and shearing zone area to calculate shearing strength. Said method is called hole-pressing method, its reliability is strong and operation is simple.

Description

technical field [0001] The invention relates to the shear strength test of machinable ceramics, in particular to a method for testing the shear strength of machinable ceramics and effectively evaluating it. Background technique [0002] Usually, the failure of materials under complex stress is controlled by the weakest stress. Therefore, the weakest ability of materials to hinder fracture is very important for safety design and reliability analysis. Ternary layered machinable ceramics is a new type of material that combines the excellent properties of metals and ceramics. This material has similar advantages: high elastic modulus and toughness, low hardness, metal electrical conductivity, excellent thermal shock performance, high damage tolerance and good processability, which are attributed to its unique crystal lattice and electronic structure. It has been found that shear-induced failure is the main failure mechanism of this type of ceramics, but how to accurately evalu...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/24
Inventor 包亦望周延春
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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