Ductile fracture of materials with high void volumefraction

Zhang, Keshi; Bai, Jinjun; François, Dominique

doi:10.1016/s0020-7683(98)00157-7

Cited by 58 publications

(47 citation statements)

References 12 publications

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“…The Rice and Tracey model [32], which analyzes the growth of a single globular void in an infinitely rigid plastic body, is also often encountered [33,34] to describe the void growth in steels as a function of both strain and stress state. However, the Gurson model [35], describing the DCI damage, is the most currently used [5,20,29,36,37]. This model is able to capture continuous nucleation and growth of voids in cast irons, but few studies were focused on the impact of temperature.…”

Section: Void Growth Damage Model With Temperature For Monotonous Tenmentioning

confidence: 99%

Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

Thuault

Hug

2015

Metals

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Tensile and compression tests were carried out on a ductile cast iron for temperatures up to 1073 K. The damage caused inside and around graphite nodules was evaluated as a function of the local equivalent plastic strain by using microstructural quantifications. The mechanical properties are strongly dependent on a temperature above 773 K. Concerning tensile behavior, an evolutional law issued from the Gurson model representing the void growth as a function of the deformation and temperature was successfully employed. It is demonstrated that the strain state and the temperature have a strong influence on the void growth function. In the case of compression tests, the temperature has a weak influence on the nodule deformation for temperatures lower than 773 K, and the mechanical behavior is driven by the viscoplastic properties of the ferrite. For higher temperatures, the mechanical properties in compression are progressively modified, since graphite nodules tend to remain spherical, and ferrite grains are severely deformed. A synthesis of the damage mechanisms is proposed in the studied range of temperature and plastic strain. It appears that the graphite nodule aspect ratio can be used OPEN ACCESSMetals 2015, 5 2352 as an indicator of the deformation under compression loading for temperatures ranging from room temperature to 673 K.

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Section: Void Growth Damage Model With Temperature For Monotonous Tenmentioning

confidence: 99%

Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

Thuault

Hug

2015

Metals

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“…Al metal has a high ductile property, but its FAB is a rapidly solidified structure with lower toughness. It was noted that the porous FAB of the ZAS80 wire had good ductility and toughness (sponge-like) for wire bonding [21,22]. After bonding, the ZAS80 FABs processed a uniform deformation behavior.…”

Section: Resultsmentioning

confidence: 99%

“…Accordingly, it is clear that a porous ball bond did not influence the stress concentration to reduce the interface strength. wire had good ductility and toughness (sponge-like) for wire bonding [21,22]. After bonding, the ZAS80 FABs processed a uniform deformation behavior.…”

Section: Resultsmentioning

confidence: 99%

Aluminium Wires Have the Free Air Balls (FABs): Electronic Flame-Off, Fracture Strength, Electrical Properties, and Bonding Characteristics of Nano Zn Film Al–Si Bonding Wires

Hung

Lui

Chu

et al. 2017

Metals

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Aluminum wire is a common material for wire bonding due to its resistance to oxidation and low price. It does not melt when becoming a free air ball (FAB) during the electronic flame-off (EFO) process with wettability and is applied by wedge bonding. This study used 20 µm Zn-coated Al-0.5 wt % Si (ZAS) wires to improve the FAB shape after the EFO process, while maintaining the stability of the mechanical properties, including the interface bonding strength and hardness. In order to test circuit stability after ball bonding, the current-tensile test was performed. During the experiment, it was found that 80 nm ZAS with wire bonding had lower resistance and its fusing current was higher. For the bias tensile test, the thicker Zn film diffused into the Al-Si matrix easily, after which the strength was reduced. The ball-bond interfaces had no change in their condition before and after the bias. Accordingly, the ZAS wire could be a promising candidate for ball bonding in the future.

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“…Al metal has a high ductile property, but its FAB is a rapidly solidified structure with lower toughness. It was noted that the porous FAB of the ZAS80 wire had good ductility-toughness (sponge like) for wire bonding [19][20]. After bonding, the ZAS80 FABs processed a uniform deformation behavior.…”

Section: Resultsmentioning

confidence: 99%

Aluminum Wires have the Free Air Balls (FABs): Electronic Flame-Off, Fracture Strength, Electrical Properties and Bonding Characteristics of Nano Zn Film Al-Si Bonding Wires

Hung

Lui

Chu

et al. 2016

Preprint

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Aluminum wire is a common material for wire bonding due to its resistance to oxidation and low price. It does not melt when becoming a free air ball (FAB) during the electronic flame-off (EFO) process with wettability, and is applied by wedge bonding. This study used 20μm Zn-Coated Al-0.5wt.%Si (ZAS) wires to improve the FAB shape after the EFO process, while maintaining stability of the mechanical properties, including the interface bonding strength and hardness. In order to test circuit stability after ball bonding, the current-tensile test was performed. During the experiment, it was found that 80nm ZAS with wire bonding has lower resistance and higher fusing current. For the bias tensile test, the thicker Zn film diffused into the Al-Si matrix easily, after which the strength was reduced. The ball-bond interfaces had no change in their condition before and after the bias. Accordingly, ZAS could be a promising candidate for ball bonding in the future.

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Ductile fracture of materials with high void volumefraction

Cited by 58 publications

References 12 publications

Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperature

Aluminium Wires Have the Free Air Balls (FABs): Electronic Flame-Off, Fracture Strength, Electrical Properties, and Bonding Characteristics of Nano Zn Film Al–Si Bonding Wires

Aluminum Wires have the Free Air Balls (FABs): Electronic Flame-Off, Fracture Strength, Electrical Properties and Bonding Characteristics of Nano Zn Film Al-Si Bonding Wires

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