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Product Code:SAE AIR5052
Title:Crack Initiation and Growth Considerations for Landing Gear Steel With Emphasis on Aermet 100 (Cancelled Dec 2004)
Issuing Committee:A-5b Gears, Struts And Couplings Committee
Scope: Steel alloys, such as AF1410 (AMS 6527, UNS K92571) and AerMet 100 (AMS 6532), have been developed which have improved Fracture Toughness characteristics compared to the current landing gear steel alloy, 300M (AMS 6419 and AMS 6257, MIL-S-8844, UNS K44220). The 300M steel is the most widely used material in current landing gear designs. It has been successfully used in thousands of applications. The use of the 300M material necessitates a safe life design criterion where components are retired after on-fourth to one-sixth the laboratory test life. This criterion was established in part due to the relative low fracture toughness of low-alloy steel in the 260 to 300 ksi strength range. The high fracture tough alloys give comparable strength levels with an increase in fracture toughness and better resistance to stress corrosion cracking. These alloys may make possible the consideration of new procedures for operation, maintenance, and inspection. For the present, these materials in the 220 to 280 ksi strength range, cannot be certified to damage tolerant design methods. Even though they may not qualify as damage tolerant in single load path applications, the improved mechanical properties alone may justify the consideration of these materials, especially in corrosive environments. In the future, they may allow on-condition maintenance, crack growth monitoring, and increased ptotential for rework. This document identifies several available materials. It compares properties of 220 to 280 ksi strength range, cannot be certified to damage tolerant design methods. Even though they may not qualify as damage tolerant in single load path applications, the improved mechanical properties alone may justify the consideration of these materials, especially in corrosive environments. In the future, they may allow on-condition maintenance, crack growth monitoring, and increased ptotential for rework. This document identifies several available materials. It compares properties of selected low-alloy steels to the higher alloyed steels. It also compares failure modes, maintenance, and inspection techniques. Although cost should be a factor when considering the material selection for landing gear application, this document will only focus on the technical aspects.selected low-alloy steels to the higher alloyed steels. It also compares failure modes, maintenance, and inspection techniques. Although cost should be a factor when considering the material selection for landing gear application, this document will only focus on the technical aspects.【英文标准名称】:Standarddataelementtypeswithassociatedclassificationschemeforelectricitems-Part1:definitions-Principlesandmethods.
【原文标准名称】:电子元器件标准数据元素类型和相关分类模式.第1部分:定义.原理和方法
【标准号】:NFC03-501-2011
【标准状态】:现行
【国别】:法国
【发布日期】:2011-03-01
【实施或试行日期】:2011-03-02
【发布单位】:法国标准化协会(FR-AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:组装件;属性;特征;分类系统;元部件;控制;合作;数据元;数据交换;数据格式;数据模型;数据类型;数据库语言;定义(术语);描述;词典;目录;电气元件;电气设备;电驱动装置;电子设备及元件;电工产品;快递;信息交换;信息模式;信息技术;材料;机械工程;方法;程序设计语言;特性;STEP;事物特性;子系统;系统;译文;测量单位
【英文主题词】:Assemblies;Attribute;Characteristics;Classificationsystems;Components;Controlling;Coordination;Dataelements;Dataexchange;Dataformats;Datamodels;Datatypes;Databaselanguages;Definitions;Descriptions;Dictionaries;Directories;Electricalcomponents;Electricalequipment;Electrically-operateddevices;Electronicequipmentandcomponents;Electrotechnicalproducts;EXPRESS;Informationinterchange;Informationmodels;Informationtechnology;Materials;Mechanicalengineering;Methods;Programminglanguages;Properties;STEP;Subjectcharacteristics;Subsystem;Systems;Translations;Unitsofmeasurement
【摘要】:
【中国标准分类号】:
【国际标准分类号】:29_100_20;35_040
【页数】:91P;A4
【正文语种】:其他