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In this paper, we examine the influence of the third invariant in computational plasticity. For this purpose we consider the extended Leon model, an elasto‐plastic model for concrete materials which accounts for the difference of shear strength in triaxial compression and triaxial extension. Consequently, the deviatoric trace of the loading surface is no longer circular like in von Mises and Drucker‐Prager plasticity. In the limit it approaches the triangular shape of the Rankine condition of maximum direct stress. Thereby, elliptic functions describe the out‐of‐roundness of the circular trace in terms of C¹‐continuous functions of the Lode angle. The algorithmic aspects of the third invariant considerably complicate the computational implementation since the radial return method of J₂‐plasticity does no longer maintain normality leading to loss of deviatoric associativity. The paper will focus on the computational issues near the three regions with high curvature at the compressive meridians with special attention on the lack of convergence of the plastic return algorithm and its slow rate of convergence in these regions. The algorithmic discussion at the constitutive level will be augmented by the axial plane‐strain compression test in order to illustrate the effect of the third invariant at the structural level of finite element analysis.

A short questionnaire was completed by 276 South Australian consumers, which examined postulated relationships between personal values, food lifestyle, demographics and their usual consumption of 24 vegetables. Principal components analyses showed that consumers' vegetable consumption could be divided into several categories, most notably salad and boiled vegetables. In multiple regression analyses different sets of values and lifestyle factors predicted intakes of overall vegetable (Rsq=27 per cent), salad (16 per cent) and boiled (27 per cent) vegetables. Path analysis revealed a complex set of pathways leading from values and personal demographics through motives, perceived food attributes and cooking skills to consumption. These partly confirmed the food lifestyle model proposed by Grunert et al. The findings show that vegetable consumption has a number of contextual and cognitive antecedents but strongly suggest that other likely predictive variables require investigation.

In the past, it has been assumed that consumers would accept novel foods if there is a concrete and tangible consumer benefit associated with them, which implies that functional foods would quickly be accepted. However, there is evidence that individuals are likely to differ in the extent to which they are likely to buy products with particular functional properties. Various cross‐cultural and demographic differences in acceptance found in the literature are reviewed, as well as barriers to dietary change. In conclusion, it is argued that understanding consumers’ risk perceptions and concerns associated with processing technologies, emerging scientific innovations and their own health status may enable the development of information strategies that are relevant to wider groups of individuals in the population, and deliver real health benefits to people at risk of, or suffering from, major degenerative illnesses.

This study aims to develop and test a process model of the effect of social media use by business-to-business (B2B) salespeople on their value cocreation and cross/upselling performance. Adopting a research acquisition perspective, the authors claim that salesperson’s social media use is critical for generating social capital – an operant resource characterized by superior market knowledge, reputation and networking – which, in turn, directly and synergistically enhances value cocreation and cross/upselling outcomes.

A model is developed based on extant sales research on salesperson’s social media use and social capital theory. Data from B2B salespeople is analyzed using structural equation modeling to test the proposed hypotheses.

The results demonstrate that salespeople’s social media use enhances their social capital with support for direct effects on market knowledge and reputation, and indirect effect on networking. The results also show that the three aspects of social capital drive value cocreation, which enhances cross/upselling performance. Post hoc analysis shows the indirect effects of salesperson’s social media use as well as the interconnected effects of the aspects of social capital on value cocreation.

The study indicates that salespeople should be encouraged to use social media as a means for enhancing market knowledge and reputation, which can then be leveraged to build networking skills. Providing training to salespeople and coaching them on how to build their social capital is essential if organizations need to capitalize on novel ways to improve the value cocreation performance of their sales teams.

This study demonstrates how salespeople’s social media use can enhance their social capital, which, in turn, is critical for value cocreation and cross/upselling performance. The proposed framework opens opportunities for future studies to examine the role of salesperson social capital and value cocreation in B2B exchanges.