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In certain cases, traction–separation laws do not reflect the behaviour sufficiently so that thin volumetric elements, Internal Thickness Extrapolation formulations, bulk material projections or various other approaches are applied. All of them have disadvantages in the formulation or practical application.

Damage within thin layers is often modelled using at cohesive zone elements (CZE). The constitutive behaviour of cohesive zone elements is usually described by traction–seperation laws (TSLs) that consider the (traction separation) relation in normal opening and tangential shearing direction. Here, the deformation (separation) as well as the reaction (traction) are vectorial quantities.

In this contribution, a CZE is presented that includes damage from membrane modes.

Membrane mode-related damaging effects that can be seen in physical tests that could not be simulated with standard CZEs are well captured by membrane mode–enhanced cohesive zone elements.

Purpose: The chapter explains how entrepreneurship can generate either subsistence, destructive, or peace-positive outcomes in the conflict zones of the Middle East and North Africa (MENA) region. Institutional arrangements are examined for how they can advance the latter.

Methodology/approach: Literatures from conflict resolution, development, economics, corporate social responsibility, entrepreneurship, and psychology are drawn on to frame the multiple roles of entrepreneurs in conflict zones, and understand the institutional arrangements that support peace-positive entrepreneurship.

Findings: The chapter indicates that formalization plays a major role in promoting peace-positive entrepreneurship while deterring destructive entrepreneurship. Conflict zone institutional arrangements that reestablish trust, can uphold the rule of law, and incentivize entrepreneurial activity aid in the formalization process. Special attention is paid to the inclusive nature of these activities, with the need to heal religious, tribal, and sectarian divides in the region, and promote the inclusion of all societal actors (namely, minorities and women) to engage in enterprising activities.

Social implications: The chapter outlines the importance for both foreign donors and local actors to understand the determinant role of institutions in conflict zone entrepreneurial ecosystems, promoting the role of institutional reform over and above the micro-level activity currently grabbing attention in the region.

Originality/value of the chapter: The chapter contrasts the singular narrative often presented on the positive role of conflict zone entrepreneurship in the informal sector, offering a paradoxical view on the topic, and arguing for formalization and institutional reform to remain aspirational among researchers and practitioners who commonly accept and promote the role of the informal sector in conflict zones.