Although from a statistical point of view we are living in the safest age to date, growing religious, ethnic and resource-related conflicts worldwide and the activities of various terrorist groups mean that people are experiencing an increased need for protection and security in all areas of life.
We, EDAG CAE & Safety, are your competent partner in the simulation-assisted development of armoured civilian and military vehicles, protective equipment, laminated safety glazing, and all kinds of special protection solutions with IMPETUS Afea Solver. We can draw on almost 30 years' experience in the development of high-security vehicles, and, by means of simulation-assisted development, every day make an important contribution to protecting life and property.
Providing all-round support for your development project, and taking initial concept studies as our basis, we work with you to develop functional protection solutions specially tailored to your requirements, and see your development process through to the successful certification of your product.
In order to protect civilians travelling on the roads from attack, the OEMs have since the late 1920s been developing high-security vehicles which, on account of the increase in demand, are offered in diverse resistance classes.
Both as experts in complete vehicle development and as a service provider for international automotive corporations, we know that, for market requirements to be met, the development cycles for these vehicles need to become shorter and shorter. Due to the resulting intensification of cost and time pressure, increasing use is being made of test simulation in this field of development, as a means of supplementing or to some extent replacing cost-intensive and often time-critical physical tests on manually constructed prototype vehicles.
A large number of firing and bombardment tests need to be carried out during the development of high-security vehicles or the armouring integrated in these, to enable the effects of structural modifications to be safely assessed. In the past, quite often the only way of doing this was to draw on estimates and empirical values from previous vehicle developments, as it was simply not possible to fully visualise exactly what would happen during an explosion or firing incident, and then subsequently derive the appropriate, precise measures.
WE SIMULATE TO UNDERSTAND REALITY AND THEN CHANGE IT
Sectional view of a blast test on the underbody of a high-security vehicle
The use of the IMPETUS Afea Solver places us in a position to test various concepts in the early stages of development. The essential advantages of virtually assisted development lie in the early, well-founded assessment of the efficiency of the selected protection concept and in the ability of the model to adapt to a wide range of threatening scenarios and certification load cases.
By carrying out detailed tests on critical areas, we are able to systematically determine possible weak points of components and systems, and can assess the residual protective effect by means of deliberately induced overload situations. This leads to a profound understanding of the various interactions that occur during blasting or ballistic impact, as a result of which strategic corrective action can then be taken to improve the protective system.
It goes without saying that, along with the expertise of our customers, the bundled know-how of additional EDAG departments also comes to bear at this point, enabling us to implement improvements arrived at by means of simulation in accordance with design guidelines and with the support of testing departments. This fully integrated, independent engineering concept enables us to offer our customers a wide-ranging portfolio of in-house development and validation services for high-security vehicle construction, personal protective equipment, safety glazing and other general protective systems.
Variation of various detailed examinations
The potential range of customers is as diverse as the various feasible simulation tasks:
- Reconstruction of certification volumes
- Adaptable detailed investigations
- Systematic analysis of weak points
- Impact scenarios in structures and target ballistics
- Simulation reconstruction of attack scenarios
- Concept studies and parameter optimisation
- Simulation of physical tests
IMPETUS AFEA - VALIDATED SIMULATION BECOMES SIMULATED REALITY
For the simulation volumes described here, we use the IMPETUS Afea Solver, which was designed by IMPETUS Afea AS primarily for extremely non-linear, highly dynamic tasks. This explicit FE solver is particularly suitable for the simulated imaging of blasting and ballistic impact on structures, and therefore for the numerical imaging of large structural dynamic deformations under extreme stress conditions.
To do justice to our responsibility to protect our greatest asset - human life - we formulate corresponding quality objectives for the predictive quality of our simulations. Throughout, we are constantly aware of the importance of this type of simulation, and so are continually working on further optimising it, to prevent an emergency from ever becoming the test run.
Apart from a numerically extremely stable solver, this also calls for detailed material and damage models, that, even when high degrees of deformation and strain rates are involved, will supply reliable results and enable ductile and brittle materials to be recorded in equal measure. As well as being able to simulate impacts caused by solid objects, we can also show the structural effects of blast waves. As the simulative measurement of gases, fluids or granulates is also possible, the effect of a buried mine, for instance, can be simulated by means of structure-particle interaction. For this reason, using conventional crash solvers to calculate these these highly dynamic processes is out of the question, as they are not entirely suitable for this type of simulation. Our database of material models, explosive charges and projectiles is constantly growing, which will also enable us to deal with future questions quickly and efficiently.
Firing at laminated safety glass and frames
We are, of course, fully aware of the fact that, even with a simulation tool as advanced as this one is, the quality of the expected simulation results can only be as good as the data input. Accordingly, the simulation still needs to be validated in order to improve the predictive quality.
Examples of some of our simulation and optimisation services during a development process are listed below:
- Construction of complex CAE models from CAD data including material properties, joining technology and separate boundary conditions
- Simulation of diverse certification requirements
- Detailed design of protective systems that function correctly and meet requirements
- Continual, iterative model optimisation and elimination of weak points
- Validation of the results on the basis of experimental data
CAN THERE BE ANY GREATER COMMITMENT THAN TO PROTECT PEOPLE'S LIVES?
Explosion of a concept tank with two shrapnel hand grenades
When developing protective systems, our primary target is always to protect human life while at the same time working within the given conditions to create an advanced product; in this way we not only live up to our own expectations, but also more than meet the defined requirements.
This applies, of course, to all applications in which highly dynamic processes with the potential to jeopardise the life and health of others are simulated. What would happen, for instance, if, just as two passenger trains are passing each other, a component comes of one of them and crashes into the front structure of the other? Will the structure be able to withstand this load, or do we need to undertake structural changes in order to reinforce the train driver's safety zone?
Impact of a standard projectile on the front structure of a passenger train
We are already dealing with questions like these, and simulating a wide variety of threatening scenarios in vehicle and special protection solutions.
THE FUTURE STARTS NOWAs we wouldn't be EDAG if we were not continually exploring new fields and possible applications, we are also working on various other matters, including the following:
- Support with the creation of a simulation model of a biofidelic crash test dummy in cooperation with Crashtest-Service-GmbH and AFUS Forschungsgesellschaft mbH
Conventional crash test dummies do not yet allow for the direct assessment of injuries, but instead record characteristic force, moment or pressure curves. In addition, there is also the risk of a relatively expensive dummy being damaged or destroyed, should a certification test prove unsuccessful. With its biofidelic behaviour that imitates that of a human being, the "Primus Breakable" tackles precisely this problem, as its damage behaviour is comparable with that of its anthropomorphic model. Accordingly, the evaluation of the injuries that might be expected in a human being and their intensity takes the form of a subsequent autopsy of the dummy.
- Development of emergency exit systems for high-security vehicles
We can manage to keep the danger locked on the outside, but what happens if a vehicle is in an accident or has withstood an attack? Can the rescue teams still gain access? Are the passengers able to get themselves out without help? Parallel to this, we are also working on new ways of getting out of a vehicle that are a far cry from conventional emergency exit systems.
- Development of laminated safety glazing and the corresponding safety frames
Applications vary from anti-terrorism windows in buildings to burglary protection in vulnerable areas, and also include the windows in high-security and emergency vehicles.
- Simulative testing of blast loads and impact scenarios on battery systems
On account of the increasing electrification of automobiles, the question of validating energy storage elements is being discussed within the context of the verification of high-security vehicles, as the intensified use of electric power in future vehicle concepts in this segment cannot be ruled out. Accordingly, we are already looking at ways of protecting energy storage systems from external forces, so that mobility can be sustained even in an emergency.
We have been working with IMPETUS Afea for several years now, and various projects have added to our in-depth and detailed knowledge. Our colleagues, Eberhard Keim, Head of Department CAE & Safety and Jan Bohlen, CAE Engineer Blast & Ballistics will be happy to help you with any questions you might have, and – always, of course, exercising the utmost discretion and confidentiality – examine them for you by means of simulation.
In our industry, safety has a very special value of its own. To ensure that we can continue to successfully protect people who, on account of their function or profession, require particular protection from attack, a new certification standard "VPAM ERV - edition 3" came into force at the beginning of 2021. Learn more about the amendments to the certification of armoured vehicles, the latest edition of the VPAM ERV and amendments to certification in accordance with VPAM ERV as well as injury assessment with the PRIMUS Breakable® in the 30-minute recording of our Defence Online Session. Register now for the recording.