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Method for testing fracture toughness of rattan canes based on three-point bending mode

A technology of three-point bending and fracture toughness, which is applied in the field of measurement, can solve problems such as complex structure, inability to fully conduct performance tests, and influence on material development, and achieve good reproducibility, high accuracy, and improved test accuracy.

Inactive Publication Date: 2015-04-29
INT CENT FOR BAMBOO & RATTAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are thousands of materials in nature. Although some materials have been widely used, due to their complex structures, performance tests cannot be carried out comprehensively, and parameters unknown to processors have affected the development of material applications.

Method used

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  • Method for testing fracture toughness of rattan canes based on three-point bending mode
  • Method for testing fracture toughness of rattan canes based on three-point bending mode
  • Method for testing fracture toughness of rattan canes based on three-point bending mode

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Embodiment 1

[0038] 1. Experimental material and sample size

[0039] Hook leaf rattan, 30-40mm in diameter, collected in Yingjiang County, Dehong Prefecture, Yunnan Province. The size of SEB specimens is based on "ASTM E399 Linear-Elastic Plane Strain Fracture Toughness of Metal Materials K Ic The requirements in the test method are prepared (such as figure 1 As shown, S=4W, B=W / 2, a / W=-0.45~0.55). The thickness of the test piece is 10mm, the width is 20mm, the crack depth is 10mm, and the number of test pieces is not less than 20. The processed test piece is placed in a constant temperature and humidity box under the conditions of temperature 20°C and humidity 65% ​​to adjust the balance, and the moisture content of the sample is 10-12%.

[0040] 2. Crack prefabrication

[0041] The distribution of vascular bundles in the diameter direction of the cane is uneven, the distribution of vascular bundles is dense at the cane bark, and the distribution of vascular bundles is sparse at the ...

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Abstract

The invention provides a method for testing the fracture toughness of rattan canes based on a three-point bending mode. The method comprises the following steps: preparing a sample, and regulating a water content rate so as to obtain a sample of which the water content rate is 10-12%; recording a load-crack opening displacement (PV) curve, measuring actual crack depths, and calculating critical loads PQ and critical stress intensity factors KQ. According to the method provided by the invention, the crack opening displacement is measured by a C.O.D Gauge, and the test precision is improved. Aiming at the characteristics of the rattan materials, the sampling method for testing the fracture toughness of rattan canes is ensured, and the measured results having high accuracy and good reproducibility are obtained. The calculation method for testing the fracture toughness of rattan cane, provided by the invention, provides qualitative and quantitative bases for the utilization of the rattan canes.

Description

technical field [0001] The invention belongs to the field of measurement, in particular to a method for measuring the strength characteristics of rattan by mechanical stress. Background technique [0002] Fracture mechanics is a reasonable approach to model failure of timber members with stress concentrations. The application of the principle of fracture mechanics to wood materials has made in-depth progress abroad. The basic principles of fracture mechanics have been widely used by foreign scholars in the control of the size of knots and glue joints in wood structures, the estimation of wood strength, wood grading, and wood drying. In the research of cracking caused by cracking and crack propagation law when wood is cut, there are many respective experimental methods to determine the fracture toughness K of wood. IC . According to the stress mode of the component, its crack growth is divided into opening type, sliding type and tearing type. The opening type (Type I) crack...

Claims

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Application Information

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IPC IPC(8): G01N3/20
Inventor 刘杏娥杨淑敏田根林尚莉莉
Owner INT CENT FOR BAMBOO & RATTAN
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