Multiple Impact Damage in GLARE Laminates: Experiments and Simulations

Experiments and finite element simulations for multiple impact were performed on GLARE 5-2/1 and aluminum 2024-T3. Experiments were conducted on aluminum 2024-T3 and GLARE 5-2/1 at diverse impact energies to produce BVID (barely visible impact damage) and CVID (clearly visible impact damage). The finite element model was developed for multiple impact analysis using ABAQUS software and was confirmed by comparing the finite element analysis outcomes with experimental results. The two- and three-dimensional failure criteria model was applied to predict multiple impact behavior such as load-time history, maximum deflection-impact energy history, and damage progression. In addition, a user subroutine VUMAT was created to represent a three-dimensional progressive failure and was linked with ABAQUS. FEM results showed good agreement with experimental data.

Modelling multiple-simultaneous impact problems with a nonlinear smooth approach: pool/billiard application

Smooth approaches are able to model reasonably well contact/impact events between two bodies, showing some peculiarities when dealing with certain geometries and arising certain issues with the detection of the initial instant of contact. The characterization of multiple-simultaneous interaction systems, considering (or not) energy dissipation phenomena (mainly friction), is always an interesting research topic, addressed from different perspectives. In the present work, the process of design, optimization and verification of a multiple-impact, day-to-day multibody novel model is shown. Specifically, we have decided to focus on a pool/billiard game due to its geometry simplicity. The model involves several balls moving freely and rolling, suffering different kinds of contacts/impacts among them and against the cushions and the cloth. In this system, the proper modelling of both contact and friction forces in the multiple, simultaneous contacts and impacts events is critical to obtain consistent results. In addition, these forces are complicated to model because of its nonlinear behaviour. The different existing approaches when dealing with multiple-contact events are briefly described, along with their most distinctive features. Then, the interactions identified on the model are implemented using several nonlinear contact-force models, following a smooth-based approach and considering friction phenomena, aiming at determining the most suitable set of both contact and friction force models for each of these implemented interactions, which take place simultaneously, thus resulting in a complex system with multiple impacts. Subsequently, the solving method that provides the most accurate results at the minimum computational cost is determined by testing a simple shot. Finally, the different interactions on the model are verified using experimental results and previous works. One of the main goals of this work is to show the some of the issues that arise when dealing with multiple-simultaneous impact multibody systems from a smooth-contact approach, and how researchers can deal with them.

Life Cycle Assessment to Ensure Sustainability of Circular Business Models in Manufacturing

Circular business models (CBMs) represent a path for coordinating circular economy (CE) efforts. Life-cycle assessment (LCA) is a tool for quantifying environmental effects of a product or a service and can therefore evaluate the environmental sustainability of CBMs. This paper explores whether LCA can act as an enabler for manufacturing companies who want to implement a CBM. Following a case-study approach, we draw on the experiences of a specific manufacturing company during the time period 2014–2021. The paper presents key lessons on the interaction between LCA and CE. The study finds that LCA—by providing quantified results on the environmental impacts of circular strategies—limits the risk of problem shifting and challenges the normative rule of closing the loop by including a set of multiple impact categories. LCA offers a common platform and encourages communication with stakeholders. These characteristics make LCA a well-suited tool for CBM development. However, the holistic perspective on environmental problems that LCA provides can also complicate CE's clear message of 'closing the loop'. Lastly, LCA is a tool for environmental evaluation, and with the main emphasis of CE also on environmental issues, there is high risk of neglecting social and economic aspects of sustainable development.

Experimental and numerical investigation of damping in a hybrid automotive damper combining viscous and multiple-impact mechanisms

One of the least investigated approaches in passive vibration control is the possibility of combining different types of dampers that use different damping principles. Such a combination process, if wisely designed and implemented, has the potential to increase the damping performance and extend the damper’s application. The primary purpose of this work is to experimentally and numerically investigate the damping behavior of a novel Fluid-Impact Hybrid Damper. This damper combines a conventional Viscous Fluid Damper with a Particle-Impact Damper. The Fluid-Impact Hybrid Damper comprises a 3D-printed plastic box attached to the Viscous Fluid Damper’s moving rod and filled with stainless steel balls. An experimental setup was designed to drive the Viscous Fluid Damper’s rod into harmonic oscillations at different frequencies (1, 2, 4, 6, and 8 Hz). The number of balls was changed three times (5, 10, and 15) to assess the effect of this parameter on the damping performance of the Fluid-Impact Hybrid Damper. A finite element model of the Fluid-Impact Hybrid Damper was developed using LS-Dyna explicit simulation program. The objective of the FE model is to investigate the elastoplastic balls-box collisions using a piecewise-linear plasticity material model. For both the experimental and numerical results, the Frequency Response Function was considered as the main comparison component for a set of force-independent results. The measured Frequency Response Functions showed a noticeable reduction in amplitude at the system’s natural frequency (2 Hz), with an acceptable accuracy between the two approaches.

Impact Culture: Transforming How Universities Tackle Twenty First Century Challenges

New ways of doing research are needed to tackle the deep interconnected nature of twenty first century challenges, like climate change, obesity, and entrenched social and economic inequalities. While the impact agenda has been shaping research culture, this has largely been driven by economic imperatives, leading to a range of negative unintended consequences. Alternative approaches are needed to engage researchers in the pursuit of global challenges, but little is known about the role of impact in research cultures, how more or less healthy “impact cultures” might be characterized, or the factors that shape these cultures. We therefore develop a definition, conceptual framework, and typology to explain how different types of impact culture develop and how these cultures may be transformed to empower researchers to co-produce research and action that can tackle societal challenges with relevant stakeholders and publics. A new way of thinking about impact culture is needed to support more societally relevant research. We propose that healthy impact cultures are: (i) based on rigorous, ethical, and action-oriented research; (ii) underpinned by the individual and shared purpose, identities, and values of researchers who create meaning together as they generate impact from their work; (iii) facilitate multiple impact sub-cultures to develop among complementary communities of researchers and stakeholders, which are porous and dynamic, enabling these communities to work together where their needs and interests intersect, as they build trust and connection and attend to the role of social norms and power; and (iv) enabled with sufficient capacity, including skills, resources, leadership, strategic, and learning capacity. Based on this framework we identify four types of culture: corporate impact culture; research “and impact” culture; individualistic impact culture; and co-productive impact culture. We conclude by arguing for a bottom-up transformation of research culture, moving away from the top-down strategies and plans of corporate impact cultures, toward change driven by researchers and stakeholders themselves in more co-productive and participatory impact cultures that can address twenty first century challenges.

ANALISIS MULTIPLAYER EFFECT KEBERADAAN PELABUHAN PERIKANAN TERHADAP EKONOMI USAHA KULINER DI PANGKALAN PENDARATAN IKAN BEBA, KEC. GALESONG UTARA, KAB. TAKALAR

This study aims to identify the types of economic activity, characteristics and perceptions of visitors, business actors, labor towards culinary businesses and to determine the multiplier effect and sustainable development strategies for culinary businesses on the economic growth of local communities. This research was conducted from November 2020 to January 2021 at the Beba Fish Landing Base, Galesong Utara, Takalar Regency. This research uses simple random sapling technique. The data of this study consisted of primary data and secondary data. Data collection was carried out using questionnaires and field observations then analyzed descriptively and multiple impact analysis (Multiplier Effect) then analyzed using a SWOT analyst. Based on the research results, there are two types of economic activities in PPI Beba, namely, fishery activities and supporting activities (culinary business) of food made from fish as the main ingredient. In general, visitors who come to PPI Beba are aged between 45 years and over with the majority of jobs being civil servants with 51% of the total visitors as a whole the rest are entrepreneurs. While the majority of business actors are women in the age range of 40 - 50 years and over. Meanwhile, 81.8% of the culinary business workforce are women with the highest level of education in Elementary Schools. In general, the three recipes gave an assessment of the PPI Beba condition which was far from good. is the main business. The characteristics of the workforce are 74.3% female and 25.7% male, with the status of 65.7% being married and ages ranging from 28 - 45 years. And in general, visitors have a perception or give a moderate to good assessment of the accessibility to PPI Beba. Culinary efforts at PPI Beba have a real economic impact on the local community. The economic impacts arising from these activities are direct impacts, indirect impacts, and induce impacts as measured by the multiplier effect value, where the results of this study obtained a multiplier effect value of 2.15 for the Keynesian Income Multiplier; 1.10 for the income multiplier type I ratio, and 1.14 for the income multiplier type II ratio. This shows that the culinary business at PPI Beba can be developed into culinary tourism to see the opportunities that exist.

Information and Communications Technology (ICT) and Agricultural Extension in Developing Countries

With new possibilities offered by information and communications technology (ICT), an abundance of products, services, and projects has emerged with the promise of revitalizing agricultural extension in developing countries. However, a growing body of evidence suggests that not all ICT-enabled extension approaches are equally effective in improving adoption, productivity, income, or welfare outcomes. In this review, we explore various conceptual and methodological threads in the literature on ICT-enabled extension in developing countries. We examine the role of multiple impact pathways, highlighting how ICTs influence behaviors and preferences, gender and intrahousehold dynamics, spillovers, and public worker incentives. We also explore the opportunities presented by ICT-enabled extension for increasing the methodological rigor with which extension outcomes are identified. These conceptual and methodological insights—coupled with empirical evidence from prior studies—offer direction for several lines of policy-relevant research on ICT-enabled extension. Expected final online publication date for the Annual Review of Resource Economics, Volume 13 is October 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

Web Atlas como Herramienta para la Gestión Integrada Costera: de los Datos al Conocimiento Práctico

Despite the importance of coastal areas to sustainable development, they are poorly known by the public or even by decision-makers. This undermines consistent action towards their protection. Existing data and information, published in very complex language, tend to be restricted to academic use. The Coastal Web Atlas as the one developed here is a tool that makes this information more accessible to managers, by preserving, integrating, comparing, and sharing data as smart maps. The spatial analysis based on multiple impact indicators facilitates the correlation of causes and effects. The Coastal Web Atlas is available to a broad audience and it could be a strong instrument for spatial planning and oversight. The authors propose to improve coastal area management by using colors on maps to decode scientific language to friendly language and to publish it on a geoportal. This technology promotes the use of collected data and enables collaborative work. A pilot experiment is being developed in the Santos Port Region, at the São Paulo state coast, Brazil: http://santoswebatlas.com.br/