Pommier A5441 Mode D'emploi page 34

The proposed alternative screwing diagram must be entered in the table below
Gross Combination Weight Rating
Thrust force
Height of screws - bumper
Moment (or lever arm)
Drilling diagram width
Drilling diagram height
Number of screws
Screw diameter
P2customer/P2 reference ratio
M2 customer/M2 reference ratio
Mounting surface area
Weighted mounting surface area
Thread root cross-section
Shear force***
Weighted shear force
* Force P2 is limited to 180kN maximum
** If G type vehicle and tipping trailer
*** The ISO 20898 T1 standard provides the minimum tensile strength for a 10.9 class screw: Rm = 1000 N/mm². The maximum shear stress is commonly
calculated as 70% of Rm, i.e. 700 N/mm².
Three criteria must be validated to be permitted to deviate from the drilling diagram recommended by POMMIER.
st
1 Criterion: Thrust force and moment
If "P2 customer" ≤ "P2" AND if "M2 customer" ≤ "M2" → Validated
nd
2 Criterion: mounting surface area
If "S customer" ≥ "Sp" AND if "A customer" ≥ "Z customer" → Validates
rd
3 Criterion: shear stress
If "F customer" ≥ "Fp" → Validated
When the 3 criteria are validated, then the drilling diagram is deemed to be compliant and feasible.
Customer parameters
Customer
GCWR
P2 customer GCWR (in kg) x 0.85 x 9.81
GCWR (in kg) x 0.85 x 9.81 x
P2 customer**
L customer
M2 customer
A customer
Z customer
N customer
M customer
α
β M2 customer / M2
S customer A customer x Z customer
Sp
Sff customer
F customer*** Sff customer x 700 x N customer
Fp
Table 10
-
0.8**
-
P2 x L
-
-
-
-
P2 customer / P2
S x α x β
Refer to Table 8
/ 1000
F x α x β
....................... kg
................... kN*
..................... mm
............... kN.mm
..................... mm
..................... mm
.............................
.............................
.............................
.............................
................... mm²
................... mm²
................... mm²
....................... kN
....................... kN
34/143