International Safe Transit Association - Event Information

Event Name:Correlation Between Horizontal Acceleration Testing and Tilt Testing for Load Stability
Description:Wednesday, 17 November from 3:00PM-3:30PM CET / 9:00AM-9:30AM EST

Prior to the upcoming ISTA European Packaging Symposium to be held this spring in Berlin, Germany, the ISTA European Division Board is pleased to present the following European-focused webinar. This webinar is conveniently scheduled during European time zones and registration is open and complimentary to anyone interested in attending.

Enrique de la Cruz Navarro
R&D Manager
Safe Load Testing Technologies

Correlation Between Horizontal Acceleration Testing and Tilt Testing for Load Stability

Transport simulation is the knowledge area which reproduces the effects of the transport hazards. The accelerations produced during transport affects the transported goods. The onboard acceleration effects could modify the load stability and it could become a risk on the road. Different technics for transport simulation are used to evaluate the load stability subjected to those forces produced during distribution. Two of these technics are the horizontal stability test and the tilt test. The horizontal stability test produces an acceleration trapezoidal transient equivalent to the transient recorded on transport vehicles on emergency braking situations, meanwhile the tilt test inclines the test sample using the gravity. The regulations from some countries, like U.S.A, Canada, European Union, New Zeeland, Australia, and some others… fix the minimum acceleration, in which a load should hold on to road transport for safety reasons. The most common values on these regulations are 0.8g on the drive direction and 0.5g for the other directions. Mostly these regulations fix the intensity, but not the durations. For example, the E.U defines the duration, using the EUMOS 40509 standard as a reference. In an emergency braking the unit load is going to suffer a maximum dynamic force function of the level of acceleration, the coefficient of friction of the unit load with the floor of the truck and a coefficient we can call “Dynamic Amplification Factor”. This coefficient that varies from 1 to 2 will depend on the horizontal natural frequency of the unit load, the duration of the emergency braking and the shape of the acceleration curve produced during braking. In a tilt test, in the procedure of the test that it is slowly reaching the equivalent tilt angle, the unit load is subjected to a tilt that produces mainly a constant acceleration, that can be calculated to be equivalent to the constant acceleration produced on an emergency braking but lacks of the maximum dynamic force which is between 1 up to 2 times the steady force produced on the tilt test. The angle to reach by tilting the equivalent horizontal steady acceleration (without taking into account the dynamic amplification factor), for a single non-deformable block, when a vehicle brake varies and goes from low angles around 16.69° for accelerations of 0.3 g up to higher angles around 42.37° for accelerations around 0.7 g. The equivalence obtained is valid if during the tilting angle the primary, secondary, or full unit load do not tip over and keeps its shape and contact between layers and surfaces. This disconnection between layers that happens when the method of tilt is used should be analyzed. The target of this paper is to define the requirements and boundary limits for a tilt test suitable for evaluate the stability of a unit load subjected to an emergency braking of a vehicle and the considerations that must be considered in the unit load to be analyzed and compare the results with the deformation obtained in a horizontal stability test.

Enrique de la Cruz Biography: Enrique de la Cruz is the R&D Manager of Safe Load Testing Technologies. He has more than 11 years of experience in research and development and transport simulation for packaging. Enrique is Electronics Systems Engineering MSi by the Universidad Politècnica de València (UPV) and Physic by the Universidad of Valencia and holds a Master’s Degree. His research efforts and knowledge have allowed him to be part of a team of experts who patented two machines of great importance for the packaging and transport sector. Furthermore, he has published several research articles in scientific journals and has participated in the most important events of the sector. Currently Enrique participates as an expert at the stability group of ISTA (International Safe Transit Association), the technical committee CEN/TC 119 about packaging and security and is member of IAPRI (International Association of Packaging Research Institute) and EUMOS - the European Safe Logistics Association.
Event Date:11/17/2021
Event Time:9:00 AM - 9:30 AM Eastern
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