Effect of Assembly Stresses on Fatigue Life of Symmetrical 65Si7 Leaf Springs

Table 4

Stress at design load and at maximum load by considering assembly stresses.

Leaf number	Thickness 𝑡 (mm)	Front/rear cantilever stress at design load, 𝑆𝑑, (MPa)	Front/rear cantilever stress at maximum load, 𝑆𝑚, (MPa)	Assembly stress, 𝑆𝑎, (MPa)	Stress at design load with assembly stress, 𝑆da, (MPa)	Stress at maximum load with assembly stress, 𝑆ma, (MPa)	𝑆𝑎⋅𝑡^2
1	8	409.48	885.11	−19	390.48	866.11	−1216
2	8	409.48	885.11	−15	394.48	870.11	−960
3	8	409.48	885.11	−12	397.48	873.11	−768
4	8	409.48	885.11	−10	399.48	875.11	−640
5	8	409.48	885.11	−8	401.48	877.11	−512
6	8	409.48	885.11	−6	403.48	879.11	−384
7	8	409.48	885.11	−5	404.48	880.11	−320
8	8	409.48	885.11	−4	405.48	881.11	−256
9	8	409.48	885.11	−3	406.48	882.11	−192
10	8	409.48	885.11	−2	407.48	883.11	−128
11	8	409.48	885.11	−1	408.48	884.11	−64
12	7	358.30	774.47	111	469.30	885.11	5439
The various assembly stresses chosen provide ∑𝑆𝑎⋅𝑡^2=−1, which is acceptable.						∑𝑆𝑎⋅𝑡^2=	−1