浅谈金属材料在汽车轻量化中的应用与发展

随着社会经济的快速发展,环境污染与能源短缺问题愈发突出,对汽车工业未来的发展带来了巨大挑战。汽车工业要想实现可持续发展,首先需要解决的一大问题就是节能减排,而实现节能减排的关键就是汽车轻量化。汽车轻量化的实现途径之一,就是使用轻质金属材料,它不仅可以达到节能减排的目的,部分材料还可以提高车身的安全性与耐久性。基于此,本文主要探究了金属材料在汽车轻量化中的应用与发展,以供大家参考。     

仿清水混凝土保护材料在船闸主体混凝土涂装中的应用

船闸混凝土外观质量的提升是船闸工程建设的重要课题，也是船闸工程美化的关键因素。为了解决船闸混凝土外观质量存在的问题，采用实验室试验和现场应用相结合的方法，评价仿清水混凝土保护材料的物理性能、耐候性能、耐污染性能和装饰效果，总结其涂装施工过程中的质量控制措施，并以岷江龙溪口船闸主体工程为例，验证该材料在船闸工程中的可行性和优越性。结果表明，清水混凝土保护材料能够渗透、防水、封固、抗老化，有效提高船闸混凝土的耐久性和美观性，并具有较高的经济效益和环境效益。     

Creep analysis of cementitious materials in seawater using a poro-chemo-mechanical model

With the rapid growth of the offshore engineering sector, studying the durability of offshore structures becomes primordial. Evaluating experimentally the coupling between mechanical and chemical degradation of the cement-based materials and structures is a challenging task because it requires tracking the evolution of the micro-mechanisms associated with the degradation in real time for long periods. To tackle this issue, a numerical approach is proposed, based on the micromechanics and the coupling between a creep-damage model and a chemical model at the microstructural scale. The seawater chemical effect on cement paste is simulated by considering the penetration fronts of the aggressive water and the attack by layers in the material. The aim of this study is to provide a tool for the rapid mechanical evaluation of the offshore structures and therefore a tool that can be used for the optimization and the development of durable marine constructions. The results highlight the competition between protective and damaged layers formed due to seawater attack, and that the global mechanical behaviour strongly depends on the chemically modified phases in the cement paste.