High-performance tensile testing machine

高性能拉力试验机

• 批准号: 454197586
• 金额: --
• 依托单位: Georg-August-Universität Göttingen
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/454197586?language=en
• 关键词: performance; tensile; testing; machine

The requested high-performance tensile testing machine is indispensable for the development of strength gradings for wood lamellas for the production of glued laminated timber, cross laminated timber and structural timber according to European standards. It makes it possible to correlate grading parameters such as knot size, natural frequency measurement, fiber deviation, position in the tree trunk (and similar) with tensile strengths and tensile modulus of elasticity. This knowledge can then be used to predict the strength of the above mentioned building materials. Using these strength values, engineers can then calculate load-bearing structures - the basis for a building application. Determination of the tensile strength is also essential for the so-called finger-jointing - a longitudinal joint of wood, which is used to produce timber of "endless" length. Without such tests it is not possible to work out the normative basis for the constructive use of, for example, beech, oak or birch wood from native forests.The last Federal Forest Inventory and the forecasts for the future availability of wood in Germany predict a sharp increase in the availability of hardwoods and a reduction in the availability of softwoods. The German construction industry uses almost 100% softwood for the construction of roof trusses, wooden houses, facades, bridges and roof structures of halls. The use of wood in construction is constantly increasing. The softwood resources that are no longer available cannot easily be replaced by hardwoods. Important scientific fundamentals are missing in the field of strength grading, general strength parameters of different products, bonding and long-term behaviour of the products. Last but not least, once the basic knowledge has been established, standards must be developed. All this is not possible without large scale tensile tests. With the high-performance tensile testing machine applied for, characteristic tensile strength values could be generated - independent from the few comparable machines, which can be found in Munich, Biel (Switzerland) and Graz (Austria) and which are running at full capacities.

所要求的高性能拉伸试验机对于根据欧洲标准生产胶合层板、交叉层板和结构木材的木材层板强度分级的开发是必不可少的。它使分级参数，如结大小、自然频率测量、纤维偏差、在树干中的位置(以及类似的)与抗拉强度和抗拉弹性模数相关。这些知识可以用来预测上述建筑材料的强度。使用这些强度值，工程师就可以计算承重结构--这是建筑应用的基础。抗拉强度的测定对于所谓的指接也是至关重要的，指接是木材的一种纵向连接，用来生产“无尽”长度的木材。如果没有这样的测试，就不可能制定出建设性使用本地森林中的山毛榉、橡树或桦木的标准基础。最新的联邦森林清单和对德国未来木材可获得性的预测预测，硬木可获得性将急剧增加，软木可获得性将减少。德国建筑业使用几乎100%的软木建造屋顶桁架、木屋、立面、桥梁和大厅的屋顶结构。在建筑中使用木材的情况在不断增加。不再可用的软木资源不能轻易被硬木取代。在强度分级、不同产品的一般强度参数、粘结和产品的长期行为方面，缺乏重要的科学基础。最后但并非最不重要的一点是，一旦建立了基本知识，就必须制定标准。如果没有大规模的拉伸测试，所有这些都是不可能的。随着高性能拉伸试验机的应用，可以产生特征拉伸强力值-独立于少数可比机器，这些机器可以在慕尼黑、贝尔(瑞士)和格拉茨(奥地利)找到，这些机器正在满负荷运行。