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.