Using Shape Memory Alloys in Automotive Safety Systems

Gheorghita, V.; Gümpel, Paul; Strittmatter, Joachim; Chiru, Anghel; Heitz, Thomas; Senn, Mathias

doi:10.1007/978-3-642-33835-9_83

Cited by 8 publications

(8 citation statements)

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“…From a practical standpoint, SMAs with smaller hysteresis are deemed more desirable for high bandwidth applications. While SMA actuators can be used in a variety of loading configurations, in most applications, tensile loading is recommended as it is the best in terms of efficiency and energy density (Bergamasco et al, 1990; Gheorghita et al, 2013b; Jani et al, 2014a; Lee and Kim, 2019; Liang and Rogers, 1992; Reynaerts and Van Brussel, 1998). The comparison of hydraulic, pneumatic, and Ni-Ti SMA actuators in regards to their efficiency, strain rate, bandwidth, and power per volume, is provided in Table 3.…”

Section: Smas In Automotive Applicationsmentioning

confidence: 99%

“…The application of SMA actuators that can be automatically repositioned after a crash is more suitable for the long-term operation of the bonnet lifting system. Generally, SMA (30 Ni-Ti) wires plaited to form shape-memory muscles are used in these systems, as this configuration has the capability to lift a 20 kg bonnet to a height of 12.5 mm within 35 ms (Barnes et al, 2008; Gheorghita et al, 2013b; Strittmatter and Gümpel, 2011). SMART (Shape Memory Alloy Resettable) systems, a combination of SMA actuation and the conventional spring method is the latest technology under consideration for such systems.…”

Section: Smas In Automotive Applicationsmentioning

confidence: 99%

“…The actuation and resetting of the SMART system are illustrated in Figure 6(g). The SMART system is still in its development phase and has not yet been released into the market (Barnes et al, 2008; Gheorghita et al, 2013b; Luntz et al, 2007; Strittmatter and Gümpel, 2011). Ultra-Fast SMA latches can be utilized to absorb energy during an impact.…”

Section: Smas In Automotive Applicationsmentioning

confidence: 99%

“…It was determined in recent years that replacing these conventional lever adjustable clamping systems with SMA actuated clamping systems could reduce the risk of knee injuries. Moreover, the absence of the lever improves driver comfort and the control of steering height through switches is more convenient for the user (Duerig, 1994; Gheorghita et al, 2013b; van Humbeeck, 1997).…”

Section: Smas In Automotive Applicationsmentioning

confidence: 99%

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A review on shape memory alloys and their prominence in automotive technology

Shreekrishna

Radhika

Nair

2022

Journal of Intelligent Material Systems and Structures

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The current generation of automobiles is known for its sophisticated safety, comfort, and performance characteristics, which were developed in order to meet the ever-growing competition and advancement in the automotive field. Consequently, the development of smart materials with unique and exceptional properties is also gaining momentum. Of the various smart material currently applied in automotive technology, Shape Memory Alloys (SMAs), which boast the unique properties of shape memory effect and pseudo-elasticity, are steadily gaining popularity. The most prevalent automotive application of this material is in SMA actuators. These actuators are compact, lightweight alternatives to mechanical actuators, providing silent operation, enhanced reliability, durability, and resistance to humidity, shock, and vibrations. They are used in a variety of automotive systems such as adjustable mirrors, windshield wipers, door locks, smart bonnets, tumble flaps, governor valves, fog louvers, hatch vents, and many more. Among the various commercially available SMAs, Ni-Ti alloys are the most extensively used in most of these applications. This paper provides an overview of the properties, applications, and challenges of SMAs in the automotive sector.

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Section: Smas In Automotive Applicationsmentioning

confidence: 99%

Section: Smas In Automotive Applicationsmentioning

confidence: 99%

Section: Smas In Automotive Applicationsmentioning

confidence: 99%

Section: Smas In Automotive Applicationsmentioning

confidence: 99%

See 2 more Smart Citations

A review on shape memory alloys and their prominence in automotive technology

Shreekrishna

Radhika

Nair

2022

Journal of Intelligent Material Systems and Structures

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“…The former (SME) is the ability to return to a predetermined shape upon simple heating; and the latter (SE) is the ability to recover large strains (∼8% under tension) upon unloading under isothermal conditions [3]. Due to these specific phenomena, SMA have attracted much interest for a wide range of applications, such as aerospace [4,5], medicaldental [6][7][8], automotive [9,10], civil construction [11] and others.…”

Section: Introductionmentioning

confidence: 99%

Castability of Cu-Al-Mn shape memory alloy in a rapid investment casting process: computational and experimental analysis

Albuquerque

Grassi²,

Araujo³

2022

Preprint

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Comparisons between virtual prototyping and experimental results are notably beneficial for the development of investment casting processes. In this research, such a comparison aimed to study the castability of a Cu-Al-Mn shape memory alloy (SMA) in a modified centrifugal investment casting process that uses centrifugal force to inject the molten metal into the mold. Virtual prototyping was numerically simulated using ProCAST software applying a rectangular mesh part design. The real and virtual parts were examined for mold filling (castability), pore formation and solidification time. Using Whitlook's methodology, it was possible to validate the model created in the ProCAST software to simulate the modified investment casting process, detecting results regarding filling, solidification and porosity with a high degree of accuracy and reliability. In addition to the validation of the developed model, this work also presents estimated values for interface heat transfer coefficient (IHTC) of the metal/mold of aluminum bronze (Cu-Al and Cu-Al-Mn) alloys poured by gravity and centrifugation into plaster molds. Among the obtained values, the IHTC for the 86.7Cu-7.9Al-5.4Mn SMA were estimated at 535 W/m²K when poured by centrifugal force and 75 W/m²K by gravity. Ultimately, it was possible to verify that Cu-Al based shape memory alloy presents a high castability and a low cooling rate.

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