GB/T 8812.1-2007 PDF EnglishUS$65.00 · In stock · Download in 9 seconds
GB/T 8812.1-2007: Rigid cellular plastics -- Determination of flexural properties -- Part 1: Basic bending test Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 8812.1: Historical versions
Similar standardsGB/T 8812.1-2007: Rigid cellular plastics -- Determination of flexural properties -- Part 1: Basic bending test---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT8812.1-2007 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 83.100 G 32 GB/T 8812.1-2007 / ISO 1209-1.2004 Replacing GB/T 8812-1988 Rigid Cellular Plastics - Determination of Flexural Properties - Part 1.Basic Bending Test (ISO 1209-1.2004, IDT) Issued on: DECEMBER 5, 2007 Implemented on: SEPTEMBER 1, 2008 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Normative References... 4 3 Principle... 4 4 Instruments... 5 5 Specimens... 6 6 Operating Procedures... 6 7 Expression of Results... 7 8 Precision... 7 9 Test Report... 7 Rigid Cellular Plastics - Determination of Flexural Properties - Part 1.Basic Bending Test1 ScopeThis Part of GB/T 8812 specifies a test method for determining the load or breaking load of rigid cellular plastic specimens at a specified deformation under the action of three-point bending load. This Part is applicable to materials with a thickness of not less than 20 mm. This Part is not applicable to easily crushable cellular plastics. This method uses small-sized specimens and does not generate pure bending deformation. Therefore, it cannot be used to calculate flexural strength or apparent flexural modulus of elasticity. The determined values can only be compared when the physical properties and dimensions of the materials are similar.2 Normative ReferencesThe clauses in the following documents become clauses of this Part through the reference by this Part of GB/T 8812.For the references with a specified date, all subsequent amendments (excluding errata) or revisions are not applicable to this Part. However, parties to agreements based on this Part are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest versions are applicable to this Part. GB/T 2918 Plastics - Standard Atmospheres for Conditioning and Testing (GB/T 2918-1998, idt ISO 291.1997) GB/T 6342 Cellular Plastics and Rubbers - Determination of Linear Dimensions (GB/T 6342- 1996, idt ISO 1923.1981)3 PrincipleThe load head applies load to the specimen supported on two supports at a certain speed. The load shall be applied perpendicular to the specimen at the center of the two supporting points (see Figure 1). Record the load value or the breaking load value when the specimen reaches the specified deformation.4 Instruments4.1 Testing Machine The material testing machine or bending testing machine shall have a load head capable of constant speed operation. Within the testing machine’s measuring range, the load accuracy shall be 1% and the displacement accuracy shall be 0.1 mm. 4.2 Supports Composed of two parallel cylinders mounted on the same horizontal plate, with an arc radius of (5 0.2) mm and a length greater than the specimen width. The span between the two supports shall be (100 1) mm. 4.3 Load Head The shape and dimensions shall be identical to the supports. The load head shall be at the center of the supports and parallel to the supports. 4.4 Measuring Tools Accuracy. 0.01 mm.5 Specimens5.1 Shape and Dimensions The specimens shall be cuboid. Length. (120 1.20) mm, width. (25 0.25) mm, thickness. (20 0.20) mm. 5.2 Preparation During specimen preparation, the cellular structure of the specimens shall not be deformed. The specimens may be skinned on one or more sides. If so, this condition shall be recorded. 5.3 Quantity Each group shall consist of at least five specimens. When the test material is suspected to be anisotropic, two groups of specimens shall be prepared, with their axes respectively parallel and perpendicular to the direction of cell elongation. When one side of the specimens is skinned, unless otherwise specified, two groups of specimens shall be tested. one with the skin in tension and the other in compression. The test results shall be separately reported. 5.4 Conditioning The specimens shall be conditioned in an environment specified in GB/T 2918.The standard test conditions are a temperature of (23 2) °C and a relative humidity of 50% 5%, or (27 2) °C and a relative humidity of 65% 10%. Depending on the intended use, other test conditions may be selected, but the test temperature is preferably selected from 196 °C, 70 °C, 10 °C, 0 °C and 40 °C.6 Operating ProceduresIn accordance with the provisions of GB/T 6342, measure the specimen dimensions. Place the specimen symmetrically on the supports and apply a load that is perpendicular to the specimen’s longitudinal axis (see Figure 1). Carefully adjust the position of the load head. When it just contacts the specimen, record this position as the zero point of specimen deformation. During operation, the load head applies the load to the specimen at a rate of (10 2) mm/min. Record the load when the specimen deformation reaches (20 0.2) mm. If the specimen breaks before reaching a deformation of 20 mm, record the load and deformation at the point of breaking. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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