ESDU A.00.01+Amendment(A)-1975 平均应力对疲劳强度的影响（光滑试件）

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1
A.00.01
THE EFFECT OF MEAN STRESS ON FATIGUE STRENGTH
(PLAIN TEST PIECE)
1. NOTATION
Both SI and British units are quoted but any coherent system of units may be used.
2. NOTES
Values of Sa/Sa0 are plotted against Sm/ft for various values of m. Any such curve relating alternating
stress and mean stress for a constant endurance N is described as an R-M diagram. The set of curves on this
Item enables the selection of an appropriate R-M diagram for a plain specimen, provided that results
appropriate to some value of mean stress are available in addition to the value of Sa0. Each such diagram
is characterised by a value of m. If Sa0 only is known, then for provisional estimation m = 1 may be assumed.
Straight lines can be drawn on the diagram intersecting both axes so as to represent constant values of the
maximum stress in a cycle, Sm + Sa. Points on the R-M diagram to the right of the intersection with such
a line occur at values of maximum stress that exceed the constant value represented by the straight line and
points to the left occur at values less than this. If such a line AB in Sketch 2.1 overleaf represents the stress
at which yielding occurs, then the point C divides the R-M diagram into MC, in which fatigue failure under
substantially elastic conditions occurs, and CN, in which fatigue failure will be preceded by marked plastic
deformation. If the criterion for point C is assumed to be that the maximum stress in the cycle is equal to
the proof stress, then it may be found conveniently as the intersection between the R-M diagram and a
straight line joining B to A on the two axes, where B has the value fp/Sa0 and A the value fp/ft .
proof stress in tension N/m2lbf/in2
tensile strength of material N/m2lbf/in2
a parameter characterising the shape of the R-M diagram
endurance
alternating stress on net area associated with SmN/m2lbf/in2
alternating stress on net area associated with Sm = 0 N/m2lbf/in2
mean stress on net area N/m2lbf/in2
f
p
f
t
m
N
Sa
Sa0
Sm
Issued June 1958
With Amendment A, February 1975
ESDU product release: 2006-01. For current status, contact ESDU. Observe Copyright.
北极星标准文库-高清标准规范分享平台 www.bjxwk.com
2
A.00.01
Sketch 2.1
3. DERIVATION
The expression
GUNN, K. Effect of yielding on the fatigue properties of test pieces containing stress
concentrations. Aeronaut. Q., Vol. VI, Part 4, pp. 277-294, November 1955.
SaSa0 1Sm
ft
------



m
–=
ESDU product release: 2006-01. For current status, contact ESDU. Observe Copyright.
北极星标准文库-高清标准规范分享平台 www.bjxwk.com
A.00.01
3
FIGURE 1
Sm / ft
0.0 0.2 0.4 0.6 0.8 1.0
Sa / Sa0
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
m
ESDU product release: 2006-01. For current status, contact ESDU. Observe Copyright.
北极星标准文库-高清标准规范分享平台 www.bjxwk.com

标签： #疲劳强度

摘要：

本文档详细解读了ESDU A.00.01+Amendment(A)-1975标准中关于平均应力对光滑试件疲劳强度影响的关键技术内容。该标准系统分析了在循环加载条件下，平均应力如何改变材料的疲劳极限与寿命，并提供了工程设计中常用的修正方法（如Goodman、Gerber及Soderberg关系）。文中特别针对无缺口（光滑）试件，阐明了应力比、应力幅值与平均应力之间的相互作用机制，以及如何通过实验数据预测不同平均应力水平下的疲劳行为。对于从事金属材料疲劳评估、结构耐久性设计及可靠性分析的工程师而言，

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作者：小气猫 分类：国外协会 价格：18星币 属性：3 页 大小：123.82KB 格式：PDF 时间：2026-03-23

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