新能源汽车冷媒胶管外层胶拉伸质量评价数据

现阶段新能源汽车空调系统为了适应环保的要求，普遍选用二氧化碳作为冷媒，对传统的氟氮碳化物作为冷媒的胶管提出了新的技术要求，且外层胶作为胶管最外层的材料，起到保护整根胶管的作用，其拉伸性能对胶管的力学性能更是影响十分明显。在动夹持器或滑轮恒速移动的拉力试验机上，将哑铃状标准试样进行拉伸，按要求记录试样在不断拉伸过程中和当其断裂时所需的力和伸长的值，计算得出产品的断裂伸长率、拉伸强度等拉伸性能结果，并将算出的性能结果与国家标准或客户技术要求进行对比判断，用于评价该产品拉伸质量是否合格，用于作出是否需要改进生产工艺、生产配方和该产品是否符合客户要求的判定依据。1、样品采集：用专用裁刀取胶管内层胶制成标准I型哑铃状试样，用测厚仪和游标卡尺分别测出待测样条的厚度和宽度，并画出两条间隔25mm±0.5mm的标准基线，并测量实际基线宽度记为标距； 2、样品测试：将试样对称地夹在拉力试验机的上、下夹持器上，使拉力均匀地分布在待测样条的横截面上，拉伸速度设置为500±50mm/min，点击触控面板上的"开始"按钮进行测试 ； 3．数据采集：每组样品测试时收集样品的变形（mm）和拉伸至该变形所需的力（N）；4、数据计算：变形÷标距×100%=应变（%）；力÷（厚度×宽度）=应力（MPa）；5、根据该样品的技术要求，应力最大值≥10MPa，且应变最大值≥200%即判定为合格，任一参数不满足技术要求即记为不合格品，用于作出是否需要改进生产工艺或生产配方的判定依据。Currently, to comply with environmental protection regulations, carbon dioxide is widely adopted as the refrigerant in new energy vehicle air conditioning systems, which imposes new technical requirements on traditional rubber hoses using nitrogen-containing fluorocarbons as refrigerants. The outer rubber layer, as the outermost material of the hose, serves to protect the entire hose, and its tensile properties exert a particularly pronounced influence on the mechanical properties of the hose. In a tensile testing machine with constant-speed moving movable grips or pulleys, standard dumbbell-shaped specimens are stretched. As required, the force and elongation values required during the continuous stretching process and at the moment the specimen fractures are recorded. Tensile performance indicators such as elongation at break and tensile strength of the product are then calculated. These calculated results are compared with national standards or customer technical requirements to evaluate whether the tensile quality of the product is qualified, and serve as the basis for determining whether production processes or formulas need to be improved, as well as whether the product meets customer requirements. 1. Sample Collection: Use a dedicated cutting tool to take samples from the inner rubber layer of the hose to fabricate standard Type I dumbbell-shaped specimens. Use a thickness gauge and vernier caliper to measure the thickness and width of the test strip respectively. Draw two standard gauge lines with an interval of 25mm±0.5mm, and measure the actual distance between the two lines as the gauge length. 2. Sample Testing: Clamp the specimen symmetrically on the upper and lower grips of the tensile testing machine to ensure that the tensile force is evenly distributed across the cross-section of the test strip. Set the tensile speed to 500±50mm/min, and click the "Start" button on the touch panel to begin the test. 3. Data Collection: During the test of each group of specimens, collect the deformation (in mm) of the specimen and the force (in N) required to stretch the specimen to that deformation. 4. Data Calculation: Deformation ÷ Gauge Length × 100% = Strain (%); Force ÷ (Thickness × Width) = Stress (MPa). 5. Qualification Judgment: According to the technical requirements of the specimens, a product is deemed qualified if its maximum stress ≥10MPa and its maximum strain ≥200%. If either parameter fails to meet the technical requirements, the product is marked as unqualified. These results serve as the basis for determining whether production processes or formulas need to be improved.