#### Filter Results:

- Full text PDF available (43)

#### Publication Year

1947

2016

- This year (0)
- Last five years (11)

#### Publication Type

#### Co-author

#### Publication Venue

#### Key Phrases

#### Method

#### Organism

Learn More

- Walter P. Murphy
- 2001

Each tower of the World Trade Center was designed to withstand, as a whole, the horizontal impact of a large commercial aircraft. Why, then, did total collapse occur? Zden Ú ek P. Ba Ú zant, Walter P. Murphy Professor of Civil Engineering and Materials Science at Northwestern University, and Yong Zhou, a graduate research assistant at Northwestern, suggest… (More)

Fracture of quasibrittle materials such as concrete, rock, ice, tough ceramics and various fibrous or particulate composites, exhibits complex size effects. An asymptotic theory of scaling governing these size effects is presented, while its extension to fractal cracks is left to a companion paper [1] which follows. The energy release from the structure is… (More)

- Michele Brocca, Zden Ek, P Ba Zant, Isaac M Daniel, Walter P Murphy
- 2001

Composite sandwich plates and shells are gaining increasing popularity in engineering practice, due to their high stiness-to-weight ratio, low thermal conductivity and energy absorption characteristics. Modeling of the structural response of a sandwich member requires knowledge of the mechanical behavior of the materials used for the facings and the core.… (More)

We consider numerical solutions of second-order elliptic partial diierential equations, such as Laplace's equation, or linear elasticity, i n t w o-dimensional, non-convex domains by the element-free Galerkin method EFG. This is a meshless method, in which the shape functions are constructed by using weight functions of compact support. For non-convex… (More)

The first part of the paper summarizes various aspects of the prediction of concrete creep and shrinkage to be discussed in the conference lecture. They include the theories of physical mechanism, prediction models, constitutive equations, computational approaches, probabilistic aspects, and research directions. The second part then presents two new… (More)

The paper shows that the excessive value of the dead load factor in the ultimate load requirements of the current structural design code implies a size effect. The size effect implied, however, does not have a rational form; it cannot distinguish among various types of failure in which very different size effects apply. This size effect partly compensates… (More)

Based on the premise that large-scale failure of sea ice is governed by fracture mechanics, recently validated by Dempsey's in-situ tests, the paper1 presents simplified analytical solutions for (1) the load capacity of floating ice plate subjected to vertical load and (2) the horizontal force exerted by an ice plated moving against a fixed structure. The… (More)

Based on the premise that large-scale failure of sea ice is governed by fracture mechanics, recently validated by Dempsey's in situ tests of fracture specimens of a record-breaking size, this two-part study applies fracture mechanics and asymptotic approach to obtain approximate explicit formulas for the size effect in two fundamental problems. In the… (More)

- Beatrice M Stefanescu, W Paul Murphy, Brenda J Hansell, Mamta Fuloria, Timothy M Morgan, Judy L Aschner
- Pediatrics
- 2003

OBJECTIVE
To determine whether the use of the Infant Flow continuous positive airway pressure (IF CPAP) system reduces the rate of extubation failure among extremely low birth weight (ELBW) infants (infants with birth weight <1000 g) when compared with conventional CPAP delivered with a conventional ventilator and nasal prongs.
METHODS
A prospective,… (More)

- P Bazant, Walter P Murphy, +8 authors Jaime Planas Finally
- 2005

Preface It is our hope that this book will serve both as a textbook for graduate courses on stability of structures and a reference volume for engineers and scientists. We assume the student has a background in mathematics and mechanics only at the level of the B.S. degree in civil or mechanical engineering, though in the last four chapters we assume a more… (More)