Can the cladding layer in composite panel materials be disregarded as a compressive element or a primary compressive element?
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Question 2: Can the cladding layer in composite panel materials be considered as a non-compressive element or a primarily compressive element? 1. The S25073 sheet metal has been included in GB/T24511-2017; its equivalent in the American standard is S32750. 2. The S25073 sheet metal has been included in NB/T47002.1-2019. 3. The S25073 sheet metal is not included in GB/T150. According to Article 2.1.3 of the Code for Pressure Vessels, if S25073 is used in components that are primarily subject to compressive forces, the material manufacturer shall conduct a evaluation in accordance with Article 1.9 of the same code. Existing issue: The composite plate S30408+S25073 (16+4 mm) has been selected for use. The coating layer (S25073) is not taken into account in the strength calculations; its use is based solely on corrosion resistance considerations. Can a manufacturer that has not undergone evaluation for S25073 be chosen to produce the coating layer for this composite plate? If a review is required, but materials from suppliers who have not undergone the S25073 review have already been purchased or selected, are there any other ways to bypass this review process? (We will not consider the approach of Amendment No. 1 to the Solid Content Regulations for now.)
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Generally, intensity calculations are not carried out; so how can there be a talk of compression?
However, whether intensity calculation is involved or not, a material certificate must be provided……
Although it is not involved in the strength calculation, it is under compressive stress in practical applications; the coating and the base layer work together to bear the load, and any problems in the coating can spread to the base layer. I called the chief editor of GB150 and was told that there is no clear specification on this. I just want to ask everyone here who is from Sichuan to pool our ideas
According to NB/T 47002.1--2019, the standards and grade designations for the cladding materials and base materials of composite panels shall comply with the provisions of the relevant material standards. The technical requirements for the substrate (such as condition at delivery, mechanical property testing, non-destructive testing, etc.) shall also comply with the provisions of GB/T 150 and JB 4732. Therefore, I believe that the coating of the composite panel meets GB/T24511-2017 requirements; material certification documents are sufficient.
Since it involves the use of materials for which no coordination standards are specified in TSG21, there is no issue with the acceptance of composite panels: handshake
In actual operation, it is certainly under compression, but when performing strength calculations, it is assumed that the laminated structure is not under compression; therefore, no calculation is done for it (the involvement of the laminated structure in strength calculations is not considered here)
If you are to treat the laminated structure as a compressed member, that is correct; however, an issue of imprecision arises here: how should the strength calculation be carried out? The calculation documents for the compressed elements are unreasonable
This post was last edited by zjq1962 on 2021-5-18 at 13:00. The composite board is a single unit as a whole; the two components serve different functions – the base layer provides strength while the coating layer ensures corrosion resistance. The material of the coating layer can be taken into account when calculating strength or it can be ignored. Clause 4.3.1 of GB150.2 permits the use of steel grades from standards other than GB24511 for cladding materials that are not taken into account in strength calculations; since S25073 is already included in the GB24511 standard, why cannot it be used? Furthermore, as a coordinating standard for pressure vessel regulations, GB150 includes NB/T47002.1 among its referenced standards; since you are purchasing a composite plate, it is sufficient for it to meet the standards applicable to composite plates. Let’s take another look at the provisions in clause 3.2 of GB150.2.
We’ve seen all of these: handshake