“We use HyperWorks and nCode DesignLife to virtually test the component to determine the durability in a short period of time. We also achieve cost savings, weight savings and ease of manufacturing/assembly by developing different concepts that suit our requirements. Another benefit is that our parent companies use HyperWorks, this enables us to share FE models and develop a common platform among FEA groups.”
– Larson Lawrence
Engineering Specialist, IVECO Australia
IVECO started using HyperWorks on the recommendation of their first CAE employee hired out of University who had used HyperMesh in school and recommended that IVECO adopt the software suite. They later discovered that their global parent companies, CNH Industrial and FCA Group were already using HyperWorks extensively. IVECO has now been doing simulation modeling for over eight years. Simulation has helped them cut down on testing time since many design concepts can be analyzed before a prototype is made. It has also enabled them to understand the behavior of a component or system under loading so that concepts can be easily generated while keeping in mind the locations of stress concentrations.
IVECO uses Altair HyperWorks and nCode DesignLife via the Altair Partner Alliance for fatigue analysis. HyperMesh has helped them mesh intricate and complicated models and has handled larger models with ease. Stress analysis for fatigue is done in OptiStruct and then the models are imported into nCode DesignLife to calculate the fatigue. For testing, nCode DesignLife is used for digital signal processing (DSP) of measured acceleration, strain, force, pressure and displacement data.
For the battery box, a mesh model was created in HyperMesh and then modal analysis was performed in OptiStruct to evaluate the battery box design. The design structure was evolved based on the mode shapes to achieve acceptable levels of natural frequency. APA software, nCode Design Life was used to correlate stress from the field to the FE model. The final design was then evaluated for fatigue using dynamic analysis with nCode DesignLife. Acceleration measured on chassis from Belgian block pavers at IVECO test tracks was used to excite the CAE model and damage was calculated based on each mode and modal participation factor of the frequencies of interest.
Transient modal fatigue life was tested at a first mode of 24 Hz. The simulation performed in nCode DesignLife reveals several areas of concern where static failure (stresses exceed UTS of steel) will occur on the existing battery box design. The virtual strain gauge tool is then used in nCode DesignLife to correlate stresses from the field with the FE model.
Conclusions and Outlook
IVECO's work in HyperWorks and nCode DesignLife resulted in an improved battery box structure. The first natural frequency of the box increased from 24Hz to 74.3 Hz, strain energy significantly reduced in areas of concern, stresses exceeding the UTS of steel were eliminated and the required fatigue life was achieved.
“We use HyperWorks and nCode DesignLife to virtually test the component to determine the durability in a short period of time. We also achieve cost savings, weight savings and ease of manufacturing/assembly by developing different concepts that suit our requirements. Another benefit is that our parent companies use HyperWorks, this enables us to share FE models and develop a common platform among FEA groups,” explained Larson Lawrence.
HyperWorks and nCode DesignLife have saved IVECO a lot of time now that they can validate several concepts before they are released for physical testing. IVECO enjoys utilizing the Partner Alliance to access software from multiple partners without leasing or buying them. "Accessibility to the wide range of Altair Partner Alliance tools such as nCode DesignLife has helped us to enhance our virtual simulation capabilities without investing exclusively for these tools with long term commitment. This has also helped us to reduce the design cost and lead time, enabling us to bring our products faster to the market with greater confidence," said Larson Lawrence. They have also used Total Materia and CADdoctor through the Partner Alliance. In the future, IVECO plans to explore more advanced options to simulate FE models in HyperMesh. They look forward to achieving additional time savings using advanced options in nCode DesignLife for fatigue analysis and plan to explore OptiStruct optimization for structures.