Housing careers, intergenerational support and family relations

The home and family have always been mutually embedded, with the former central to the realization and reproduction of the latter. More recently, this mutuality has taken on a more critical salience as realignments in housing markets, employment and welfare states in many countries have worked together to undermine housing access for new households. In this context, families have become increasingly involved in smoothening the routes of young adults members up the ‘housing ladder’ into home ownership. Intergenerational support appears to have become much more widespread and not just confined to familialistic welfare regimes. The role of intergenerational support for housing remains, however, highly differentiated across countries, cities and regions, as well as uneven between social and income classes. This introduction to the Special Issue explores how the role of housing wealth transfers has impacted the renegotiation of the generational contract. In doing so, it sets the scene for the articles that follow, each of which contribute significantly to advancing understanding of housing as a key driver of contemporary social relations and inequalities

Acceleration and localization of subcritical crack growth in a natural composite material

Catastrophic failure of natural and engineered materials is often preceded by an acceleration and localization of damage that can be observed indirectly from acoustic emissions (AE) generated by the nucleation and growth of microcracks. In this paper we present a detailed investigation of the statistical properties and spatiotemporal characteristics of AE signals generated during triaxial compression of a sandstone sample. We demonstrate that the AE event amplitudes and interevent times are characterized by scaling distributions with shapes that remain invariant during most of the loading sequence. Localization of the AE activity on an incipient fault plane is associated with growth in AE rate in the form of a time-reversed Omori law with an exponent near 1. The experimental findings are interpreted using a model that assumes scale-invariant growth of the dominating crack or fault zone, consistent with the Dugdale-Barenblatt “process zone” model. We determine formal relationships between fault size, fault growth rate, and AE event rate, which are found to be consistent with the experimental observations. From these relations, we conclude that relatively slow growth of a subcritical fault may be associated with a significantly more rapid increase of the AE rate and that monitoring AE rate may therefore provide more reliable predictors of incipient failure than direct monitoring of the growing fault