Subframe Permissible Material - Hyundai Body Builder 2015 Manual

INTRODUCTION PRELIMINAR STUDIES AND CONSIDERATIONS
MOUNTING AND CONSTRUCTION
1
2
Fig. 5-99
5.2.2
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.
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:
σu
σy
Table 1-100 LCV_SPBTC52_001 Recommended subframe materials
V1.0, February 2015
POWER TAKE-OFF
Body
Chassis frame
SPBGC52_001 Subframe attachment

Subframe permissible material

See chapter 5.2.3 "Subframe: permissible sections".
MATERIAL
TYPE
(N/mm²)
High level 390~540
Low level 370~500
Ultimate tensile strength (N/mm²)
Yield strength (N/mm²)
Body Builder Manual Part II, Specific Book LCV
MAINTENANCE AND DAMAGE PREVENTION
ELECTRIC AND ELECTRONIC SYSTEMS
3
4
σ σ
y
(N/mm²)
590
590
ε
t
WORK ON BASIC VEHICLE
Subframe
Connections
ε
u
(%)
17
25(t<1)
27(t>1)
Elongation (%)
thickness(mm)
APPENDIX
147