Energy Absorbency and Impact Resistance of D3O® Materials Under Dynamic Impact Loadings
Anas A. Shargawi,
Michael J. Jorgensen,
Nils A. Hakansson,
Ryan Z. Amick,
Ramazan Asmatulu
Issue:
Volume 10, Issue 1, June 2023
Pages:
1-10
Received:
30 July 2022
Accepted:
9 January 2023
Published:
17 January 2023
Abstract: Hand-held power tools, such as percussive riveting tools, produce vibrational forces that are transmitted through the hands, arms, and elbows. These vibrational forces may be responsible for the causation of short and long-term neuronal and/or vascular diseases. Personal protective materials are available commercially, some of which are used during the operation of percussive power tools (e.g., anti-vibration gloves). In previous studies, D3O® materials showed a greater absorption of impact energy in low-velocity static impact testing compared to conventional materials. In this study, D3O® materials were tested under dynamic impact loadings to evaluate resistance to impact characteristics to assess the adequacy of an ergonomic intervention using D3O® materials. An experiment was performed to evaluate material resistance to impact by evaluating the peak load values with different precompression magnitudes and loading frequencies. D3O® materials showed that compression magnitude was a statistically significant factor (p = 0.00) affecting the peak load value compared to loading frequency, which had little to no effect when tested under 14 Hz or less. As peak loads increase, the resistance to impact loading decreases and energy transmission increases. D3O® back protector (DBP) and D3O® Rifle Harness (DRH) exhibited lower peak values compared to D3O® Recoil Pad (DRP) material. D3O® materials may be considered to be utilized in a riveting and bucking intervention to reduce vibrational forces from percussive tools in a dynamic aircraft manufacturing environment.
Abstract: Hand-held power tools, such as percussive riveting tools, produce vibrational forces that are transmitted through the hands, arms, and elbows. These vibrational forces may be responsible for the causation of short and long-term neuronal and/or vascular diseases. Personal protective materials are available commercially, some of which are used during...
Show More
Research Article
From Earth to Orbit: The Evolution of Launchers and Their Impact on Satellite Deployment
Diriba Gonfa Tolasa*
Issue:
Volume 10, Issue 1, June 2023
Pages:
11-23
Received:
26 March 2025
Accepted:
10 April 2025
Published:
29 April 2025
DOI:
10.11648/j.ajae.20231001.12
Downloads:
Views:
Abstract: The advancement of launch vehicles has been pivotal in shaping the landscape of space exploration and satellite deployment. This abstract examines the historical evolution of launchers, from early ballistic rockets to contemporary reusable systems, and their profound impact on the deployment and operational capabilities of satellites. The development of launch technology has paralleled the increasing complexity and functionality of satellites, enabling a diverse array of applications ranging from telecommunications and Earth observation to scientific research and interplanetary exploration. Initially, the field of rocketry was characterized by rudimentary designs and limited payload capacities, primarily driven by military objectives during the mid-20th century. The transition to space exploration catalyzed the development of more sophisticated launch systems, exemplified by the introduction of the Saturn V rocket, which facilitated human exploration of the Moon. This era marked a significant leap in engineering capabilities, setting the stage for subsequent advancements in launch technology. The advent of the Space Shuttle program in the 1980s introduced a paradigm shift in satellite deployment, allowing for the transportation of multiple payloads and the servicing of existing satellites in orbit. However, the high operational costs and complexity of the Shuttle system prompted the search for more economical and efficient launch solutions. This led to the emergence of commercial launch providers, such as Space X and Blue Origin, which have revolutionized the industry with the development of reusable rocket technology. The Falcon 9, for instance, has demonstrated the feasibility of reusing first-stage boosters, significantly reducing launch costs and increasing the frequency of satellite deployments. Moreover, the evolution of launchers has been closely linked to advancements in satellite technology. Modern satellites are equipped with sophisticated instrumentation and capabilities, necessitating launch vehicles that can accommodate larger payloads and deliver them to precise orbits. The integration of small satellite technology has further diversified the launch market, leading to the proliferation of dedicated small satellite launchers and rideshare missions.
Abstract: The advancement of launch vehicles has been pivotal in shaping the landscape of space exploration and satellite deployment. This abstract examines the historical evolution of launchers, from early ballistic rockets to contemporary reusable systems, and their profound impact on the deployment and operational capabilities of satellites. The developme...
Show More
