7075 aluminum tube will explode under pressure

Generally speaking, the pressure resistance of the aluminum pipe is determined according to the actual size of the aluminum pipe. The pressure resistance of different sizes is different. The pressure calculation formula of the aluminum pipe: [P] = (2[ σ t] φ (S-C))/((Di+(S-C))[ σ t] Is the allowable stress, φ Is the number of safety system, s is the wall thickness, C is the additional amount of wall thickness (considering corrosion), and Di is the inner diameter of the pipe.

For example, how much MPA can 7075-T651 aluminum alloy pipe with outer diameter of 32mm, wall thickness of 3mm and length of 700mm bear?

7075-T6, yield strength: 505mpa, allowable stress[ σ t] = 505mpa * 0.65 = 328mpa, considering that the additional amount is 1mm, that is, 3mm is calculated as 2mm, so the maximum allowable stress [P] = (2 * 328 * 0.85 * (3-1)) / (26 + (3-1)) = 39.8mpa

According to this calculation, the other is 66.2mpa

7075 aluminum pipe is a cold treated forging alloy with high strength, far better than mild steel. General corrosion resistance, good mechanical properties and anode reaction. The fine grains make the deep drilling performance better, the wear resistance of the tool is enhanced, and the thread rolling is more unique. Zinc is the main alloying element in 7075. Adding magnesium to the alloy containing 3% - 7.5% zinc can form mgzn2 with remarkable strengthening effect, which makes the heat treatment effect of this alloy far better than that of aluminum zinc binary alloy. Increasing the content of zinc and magnesium in the alloy will further improve the tensile strength, but its ability to resist stress corrosion and exfoliation corrosion will decrease. After heat treatment, it can reach very high strength characteristics.

7075 aluminum tube will explode under pressure

Mechanical properties of 7075 aluminum pipe

Tensile strength σ b (MPa)：≥205

Elongation stress σ p0.2 (MPa)：≥170

Elongation δ 5 (%)：≥7

Note: longitudinal mechanical properties of bar at room temperature

Sample size: diameter ≤ 12.5

The components of pressure aluminum pipes are generally standard parts, so the design of pressure pipe components is mainly the selection of standard parts, and the determination of pipe pressure grade is also the determination of standard parts grade. The pressure grade of the pipeline includes two parts: the nominal pressure grade of the standard pipe fittings expressed by the nominal pressure; Wall thickness grade of standard pipe fittings expressed in wall thickness grade.

Pressure grade of pipeline: generally, the parameters in the aluminum pipe that can reflect the pressure bearing characteristics of the pipeline determined by the nominal pressure grade and wall thickness grade of the standard pipe fittings are called the pressure grade of the pipeline. In order to simplify the description, the nominal pressure grade of the pipe fittings in the pipeline is often called the pressure grade of the pipeline. The determination of pressure grade is the basis and core of pressure pipeline design.

It is the design precondition of pressure pipeline layout and pressure pipeline stress check, and also an important factor affecting the infrastructure investment and pipeline reliability of pressure pipeline.

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