www.夜夜草 I 在线成人免费网站 I 人人干人人草 I 亚洲最大成人在线 I www.色999 I 成人免费视频视频免费看 I 国产精品女同一区二区三区久久夜 I 两性色午夜视频免费无码 I 国产乱码精品一区二区三区中文 I 九九热视频精品 I 中文在线天堂а√在线 I 亚洲日本乱码一区二区产线一∨ I 张津瑜警花国产精品一区 I 久久精品国产精油按摩 I 久久亚洲精选 I yellow在线看 I 老汉色老汉首页a亚洲 I 国产成人亚洲精品狼色在线 I 亚洲国产品综合人成综合网站 I 欧美a视频 I 亚洲狼人伊人 I 网址成人 I 三级毛片网站 I 国产毛片无遮挡 I 国产美女特级嫩嫩嫩bbb I 国产成人尤物在线视频 I 免费日比视频 I 日本一本一道 I 日韩一区二区福利 I 色二区 I 欧美日韩综合一区二区三区 I 美女网站色精品尤物极品姐弟 I 中文字幕av 一区 I 色诱惑直播在线观看 I 亚洲国产精品资源

What are the main applications of test machines in the construction industry?

What are the main applications of test machines in the construction industry?

The application of construction industry testing machine mainly includes metal pipe, plastic pipe, floor tile, concrete and building material, which can be divided into structural material, decorative material and some special materials. Structural materials include wood, bamboo, stone, cement, concrete, metal, bricks, tiles, ceramics, glass engineering plastics, composite materials, etc. Decoration materials include various coatings, paints, coatings, veneers, ceramic tiles of various colors, glass with special effects, etc. Special materials are used for drawing, compressing, bending, tearing, 90 degree peeling, 180 degree peeling, etc. Shear test, adhesion test, pull-out test, elongation test, etc.

Details are as follows:

I. THE CONCEPT OF STRENGTH

It refers to the ability of material to resist damage under external force (load).

Types of Strength

According to the force form (as shown in the figure), it can be divided into four kinds: compressive strength, tensile strength, bending strength and shear strength.

3. Calculation of Strength

Formulas for Compressive Strength, Tensile Strength and Shear Strength

F = F/ A

F - Compressive, Tensile and Shear Strength (Pa MPa) of the material.

F - Maximum load (N) at failure of specimens.

A - Area of specimen (m2 or mm2).

The bending (bending) strength of materials is related to the stress, section shape and supporting conditions of materials.

For a rectangular section supported at both ends and with a concentrated load acting in the middle, its bending resistance (bending)

Strength is calculated by the following formula: f = 3 FL / 2 B H2Deformation Performance

1. Elasticity: Deformation that a material can completely recover is called elastic deformation. Materials with this deformation feature are called elastic materials.

2. Plasticity: Deformation that cannot be restored by material is called plastic deformation. Plasticity is called plastic material.

3. Brittleness: Under the action of load, the material has no obvious omen, which is characterized by sudden failure.

4. Toughness: Toughness, also known as impact toughness, is the property of materials under impact and vibration loads, which can withstand large deformation without sudden damage.