标准名称：	木材横纹抗压弹性模量测定方法
英文名称：	Test method for the anticompressive elastic module of transverse fiber of wood
中标分类：	农业、林业 >> 林业 >> 原条与原木
ICS分类：
替代情况：	替代GB 1943-1980;被GB/T 1943-2009代替
发布部门：	国家林业局
发布日期：	1991-05-03
实施日期：	1992-01-01
首发日期：	1980-04-19
作废日期：	2009-08-01
主管部门：	国家林业局
归口单位：	全国木材标准化技术委员会
起草单位：	中国林科院木材研究所
出版日期：	1900-01-01
页数：	4页

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Product Code:SAE J2505
Title:Measurement of Vehicle-Roadway Frictional Drag
Issuing Committee:Accident Investigation And Reconstruction Practices Cmte
Scope:This SAE Recommended Practice provides guidelines for procedures and practices used to obtain and record measurements and to analyze and present results of frictional drag tests of a vehicle with its brakes fully applied at a given roadway location. It is for use at accident sites and test sites and is applicable to straight-line stopping of vehicles such as passenger cars, light trucks and vans under fully braked conditions including locked-wheel skids for vehicles with a conventional braking system and for vehicles with full or partial antilock braking systems (ABS). The average deceleration resulting from a given series of tests is intended to be representative of a frictional drag factor for the conditions under which the test was conducted such as the type of vehicle, type and condition of tires, roadway material and roadway surface conditions. The frictional drag factor is intended to conform to use with the stopping distance formula (Fricke, 1990) as stated in Equation 1. Two methods are included: Stopping Distance Method (measurement of the distance required to bring a vehicle to a complete stop from a known initial speed) and Average Acceleration Measurement (using acceleration measuring devices and data analysis to determine the average drag factor). The Recommended Practice applies to vehicles stopping in a fully braked condition. Values of roadway frictional drag obtained by other means do not necessarily agree or correlate (Lock, et al., 1982) with full vehicle testing and are not recommended.