Shaoyi Liu, Songjie Yao, Song Xue, Benben Wang, Hui Jin, Chenghui Pan, Yinwei Zhang, Yijiang Zhou, Rui Zeng, Lihao Ping, Zhixian Min, Daxing Zhang and Congsi Wang
Surface mount technology (SMT) is widely used and plays an important role in electronic equipment. The purpose of this paper is to reveal the effects of interface cracks on the…
Abstract
Purpose
Surface mount technology (SMT) is widely used and plays an important role in electronic equipment. The purpose of this paper is to reveal the effects of interface cracks on the fatigue life of SMT solder joint under service load and to provide some valuable reference information for improving service reliability of SMT packages.
Design/methodology/approach
A 3D geometric model of SMT package is established. The mechanical properties of SMT solder joint under thermal cycling load and random vibration load were solved by 3D finite element analysis. The fatigue life of SMT solder joint under different loads can be calculated by using the modified Coffin–Manson model and high-cycle fatigue model.
Findings
The results revealed that cracks at different locations and propagation directions have different effect on the fatigue life of the SMT solder joint. From the location of the cracks, Crack 1 has the most significant impact on the thermal fatigue life of the solder joint. Under the same thermal cycling conditions, its life has decreased by 46.98%, followed by Crack 2, Crack 4 and Crack 3. On the other hand, under the same random vibration load, Crack 4 has the most significant impact on the solder joint fatigue life, reducing its life by 81.39%, followed by Crack 1, Crack 3 and Crack 2. From the crack propagation direction, with the increase of crack depth, the thermal fatigue life of the SMT solder joint decreases sharply at first and then continues to decline almost linearly. The random vibration fatigue life of the solder joint decreases continuously with the increase of crack depth. From the crack depth of 0.01 mm to 0.05 mm, the random vibration fatigue life decreases by 86.75%. When the crack width increases, the thermal and random vibration fatigue life of the solder joint decreases almost linearly.
Originality/value
This paper investigates the effects of interface cracks on the fatigue life and provides useful information on the reliability of SMT packages.
Details
Keywords
Yingwei Ren, Biqian Zhang, Lei Zhao and Yinwei Bu
Performance pressure is unavoidable in the career of any frontline employee in the service industry, yet the authors have little understanding of the dualistic nature of…
Abstract
Purpose
Performance pressure is unavoidable in the career of any frontline employee in the service industry, yet the authors have little understanding of the dualistic nature of performance pressure. This study aims to distinguish between challenge performance pressures and hindrance performance pressure and to investigate the effect of challenge/hindrance performance pressure on in-role/extra-role service performance through distinct emotional-labor-strategy mechanisms.
Design/methodology/approach
Study 1 conducted exploratory and confirmatory factor analyses and developed a performance pressure scale. To test the predictive validity of this scale, Study 2 used data from 178 frontline employees based on diary and experience sampling spanning 18 consecutive calendar days.
Findings
Findings revealed that surface/deep acting mediated the relationship between hindrance/challenge performance pressure and in-role/extra-role service performance. Calling moderated the relationship between emotional labor and service performance. The relationship between surface acting and in-role service performance was weaker in the higher calling condition, whereas the relationship between deep acting and extra-role service performance was weaker in the higher calling condition.
Practical implications
Service organizations should motivate employees to preserve more challenge performance pressure rather than hindrance performance pressure through establishing a reasonable performance target system. Furthermore, organizations can encourage employees to provide more extra-role services for customers through establishing an emotional support system, so as to enhance customer satisfaction.
Originality/value
To the best of the authors’ knowledge, this study is a pioneering effort to develop a dualistic performance pressure scale and explore the impact mechanism and boundary conditions of performance pressure on service performance in the presence of emotional labor.
Details
Keywords
Wei Yin and Kent Matthews
China as a main emerging and transition economy has since 2006 opened up its banking market to foreign competition. Thus far, the penetration of foreign banks has been only…
Abstract
Purpose
China as a main emerging and transition economy has since 2006 opened up its banking market to foreign competition. Thus far, the penetration of foreign banks has been only moderate with around 2 per cent market share of the total banking market, despite the widely held view that foreign banks operate at a higher level of efficiency and that Chinese state-owned banks (SOBs) operate at a lower level of efficiency. The purpose of this paper is to explore the relationship between bank ownership and the lending behaviour and relationship banking that stems from the Chinese tradition of “guanxi”.
Design/methodology/approach
Based on three bank types the authors construct a model of the choice of bank type and show how that model can be estimated using a multinomial logit. The authors assume that firms choose a bank type as a function of firm characteristics (Berger et al., 2008; Ongena and Sendeniz-Yüncü, 2011), deal terms (Machauer and Weber, 2000; Ziane, 2003), and industry classification (Uchida et al., 2008; Ongena and Sendeniz-Yüncü, 2011).
Findings
This paper finds the existence of a close banking relationship of a “guanxi” type between SOBs and state-owned enterprises (SOEs). This is shown up in the form of better deal terms for the SOE. In the case of foreign banks the authors find that a foreign bank-foreign owned enterprise relationship exists but this is based on risk quality and no advantages in deal terms, which suggest a more commercial-based relationship. The empirical findings are that transparent and high-quality firms are likely to engage with foreign banks, while state-owned firms are more likely to engage with SOBs.
Originality/value
In China, few studies have addressed the potentially important role of bank ownership on lending behaviour (e.g. Firth et al., 2008; Berger et al., 2009). The authors extend the analysis by distinguishing not only between foreign and domestic banks, but also between SOBs and other domestic banks. This research seeks to enhance the understanding of bank ownership, lending behaviour and relationship banking.