INTRODUCTION
PRELIMINAR STUDIES AND CONSIDERATIONS
MAINTENANCE AND DAMAGE PREVENTION
WORK ON BASIC VEHICLE
MOUNTING AND CONSTRUCTION
POWER TAKE-OFF
ELECTRIC AND ELECTRONIC SYSTEMS
APPENDIX
V1.0, February 2015
Body Builder Manual Part II, Specific Book LCV
147
Fig. 5-99 SPBGC52_001 Subframe attachment
5.2.2
Subframe permissible material
When loads are not high and the operations of the body during its work are not too
demanding, a material with a lower quality than the quality of the chassis frame can
be used for the subframe, as for example in the case of an aluminum subframe at
-
tached to a chassis frame of steel. However, a minimum resistant module must
always be achieved, depending on the situation, and taking into account the differ
-
ent yield strength limits of each material. In cases where the subframe must have
the strength and stiffness to withstand high loads, for instance with tipper bodies,
cranes, centre axle trailers, etc. the use of aluminum subframes is not recom
-
mended.
See chapter 5.2.3 "Subframe: permissible sections".
The required resistance of the subframe under the loads to be supported must be
estimated by calculation. So a material for the construction of bars must be chosen,
such as steel alloy or aluminum, which will confer different characteristics to the
subframe and determine its resistance, properties and flexibility.
HMC recommends different types of material to build the subframes:
Table 1-100 LCV_SPBTC52_001 Recommended subframe materials
1
Body
3
Subframe
2
Chassis frame
4
Connections
MATERIAL
TYPE
σ
y
(N/mm²)
σ
u
(N/mm²)
ε
(%)
High level
390~540
590
17
Low level
370~500
590
25(t<1)
27(t>1)
σu
Ultimate tensile strength (N/mm²)
ε
Elongation (%)
σy
Yield strength (N/mm²)
t
thickness(mm)