Automotive Engineering - September 2024 - 26

BLAZER EV
IS A
STEELMATERIALS
FEATURE
INTENSIVE
SHOWCASE
Blazer EV Body Structure: Materials Composition
11%
15%
9%
5%
15%
45%
Strategic selection of Blazer EV metals led by steel with aluminum side rails
playing a vital supporting role.
Blazer EV RESS Structure: Materials Composition
All Steel
Martensitic Steel
(MS1500)
18%
33%
Medium High Strength Steel
(BH270)
25%
23%
Ultra High Strength Steel
(≥980 MPa)
0.7%
0.1%
Medium High Strength Steel
(HSLA 340-550)
uses a 10-module or 12-module Ultium battery pack
(what GM calls the RESS, or rechargeable energy storage
system). The all-steel RESS is unusual in an industry
that has thus far favored aluminum battery enclosures.
It is carried over entirely from the Lyriq and employs
press-hardened steels (PHS), which are key to its
structural role in the vehicle and its impact performance.
PHS makes up 11% of the total.
The EV's small-or-large battery sizing required a
Advanced High Strength Steel
(DP590-780)
Mild Steel
The Blazer EV's steel-intensive battery enclosure is unique among aluminumintensive
competitors.
B l a z e r E V
B IW S t i f f n e s s
Torsion KN-m/deg
12 MOD Base Roof (Target>31)
10 MOD Base Roof (Target>28)
12 MOD Sunroof (Target>31)
10 MOD Sunroof (Target>28)
34.9
32.4
31
28.4
new approach to managing the 500 kg (1,102 lb) mass.
Special stamped-steel front rails were developed " to
bring the total mass variation of the two RESS packages
into one front subsystem, " Eiliat said. " And we
still managed to commonize parts between the two. "
Blazer EV's frontal- and side-impact load manageBending
Hz
Performance
25.4
GM's body engineers exceeded their stiffness targets in developing the Blazer EV.
26 September 2024
ment strategies use the body and RESS in unison. " Our
strategy was to manage the load between battery and
body in one-third and two-thirds proportions, with
two-thirds of the load transmitted through the body
and one-third through the battery, " Eiliat explained.
" In the event of a full flat barrier engagement, the load
transmits from the front rail then into the first crossbar
in the RESS, then splits into the center tunnel and also
into the rockers. The same thing happens in the rear,
where forming the crossbars in press-hardened steel
helps minimize intrusion. "
Enabling the body and RESS to " talk to each other " is
what GM calls a Cradle Bolt Stabilizer, basically a shear
plate that connects the front cradle with the body at one
point and connects the body and the rails at two points.
AUTOMOTIVE ENGINEERING
Blazer EV chief engineer Hoda Eiliat shares insights into the new
SUV at GDIS 2024.
CLOCKWISE FROM TOP LEFT: CHEVROLET; LINDSAY BROOKE; CHEVROLET; CHEVROLET;

Automotive Engineering - September 2024

Table of Contents for the Digital Edition of Automotive Engineering - September 2024

Automotive Engineering - September 2024 - INTRO
Automotive Engineering - September 2024 - SPONSOR
Automotive Engineering - September 2024 - CVR1
Automotive Engineering - September 2024 - CVR2
Automotive Engineering - September 2024 - 1
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Automotive Engineering - September 2024 - CVR3
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