A Study on Rear Bumper Back Beam for Modular Architecture
-Developed by Dividing into Platform Fixed Module and Design Change Module-

Hongheui Lee (Hyundai Motor)

Architectural development system is a shift from the existing platform development system to the module development strategy. The module development strategy focuses on the common development capability of the platform to secure the basic performance and quality of the vehicle. The main concept is to maximize the effect of commonization by developing minimum variable parts that require separate development around fixed parts. The rear bumper back beam is one of the external system parts. It was selected as a part with high design freedom, and a modular design was performed to satisfy collision performance regulations and marketability.

UN Regulation No. 155 on Vehicle Cyber-Security. Technical Service Perspective and Challenges

Oriol Flix Viñas･Carlos Lujan Tutusaus･Andrés Aranda Martínez (Applus+ IDIADA)

Technical Services for Type-Approval have suffered a deep transformation in the last few years to be able to deal with the new regulatory challenges, especially those linked to UN Regulation N. 155. IDIADA has been involved from the very first steps of the drafting process and is currently one of the Technical Services with a highest level of activity in this
field. Thus, the testimony of IDIADA represents a wide spectrum of the challenges encountered by the different stakeholders during the implementation of UN Regulation N.155

Enhanced Material Model for Composite Crash Performance at Ply Level
-*MAT_262 Evolution-

Alfredo Alameda･Alejandro Dominguez･Eduardo Martin-Santos (Applus+ IDIADA)･Tomohiko Max Miura (TOYOTA GAZOO Racing Europe)

Structural crash performance of lightweight composite structures is driven mainly by fracture propagation. Thus, an accurate prediction considering relevant mechanisms during failure onset and propagation is mandatory. LS-DYNA *MAT_262 and *MAT_058 laws are used for crash simulation of continuum FRPs at ply-level.
Comparing CAE and testing, predictivity of both laws is insufficient when a combination of crushing and bending is dominant, resulting in compromised prediction level between these mechanisms.
In this paper, limitations in *MAT_262 are identified and enhancements are developed to expand its current capabilities and achieve better predictivity using a single material card for bending-crushing driven load cases.

Development of Technology for Predicting Fracture of Point Joints during Collision

Yoko Okawa･Shota Chinzei (Kobe Steel)

The fracture of welds in a vehicle collision may cause a significant deterioration of occupant protection performance. Therefore, it is very important to predict the risk of fracture at the design stage and design a structure that can avoid fracture. In this study, a fracture prediction model that can consider the effects of plate thickness and nugget diameter on fracture strength was realized by improving a generic analytical model. It was confirmed that good fracture prediction accuracy was obtained.