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Tuesday, June 23, 2009

Boeing's 787 Delayed for Reinforcement

The 787 is the first commercial aircraft in which major structural parts are made of composites rather than aluminum alloys.
By David Talbot
Credit: Boeing

It's not easy being a green airliner. The 787 Dreamliner--Boeing's midsize, fuel-efficient passenger jet--is being delayed again.

The maiden flight of the 787--already two years overdue--was to take place on June 30, but today Boeing announced an indefinite delay to add more structural reinforcements.

"Consideration was given to a temporary solution that would allow us to fly as scheduled, but we ultimately concluded that the right thing was to develop, design, test and incorporate a permanent modification to the localized area requiring reinforcement," Scott Carson, president and CEO of Boeing's commercial-airplanes division, explained in a statement. "Structural modifications like these are not uncommon in the development of new airplanes, and this is not an issue related to our choice of materials or the assembly and installation work of our team."

Carson's mention of materials is important. The 787 is the first commercial aircraft in which major structural parts are made of composites rather than aluminum alloys. The difference slashes weight and helps boost the fuel efficiency of the plane by 20 percent. Back in 2003, we reported on this pioneering effort in commercial aviation.

Composite materials are notoriously difficult to model. Their fiber layers are oriented in different directions, and each layer is made of many individual fibers that vary somewhat in thickness. Such complex materials are far harder to precisely re-create in computer models, compared to monolithic chunks of aluminum. And Boeing has encountered trouble with 787 composites before. As we reported last spring, the company said that parts of the 787's composite-made wing box--the major structural piece inside each wing, measuring more than 15 meters by 5 meters and weighing 55,000 pounds--had buckled in stress tests. To fix that problem, Boeing added new pieces and brackets and rerouted wiring to accommodate the retrofits.

The new schedule for the first flight--and the first delivery of some of the 865 787s that have been ordered by airlines--will not be available for several weeks, the company said.

Comments

  • quick comments
    although the 787 is the first to use composites for a majority of the critical aircraft surfaces in a commercial airplane, airbus has been using it for many years in the tail section in many of their modern aircraft.  given how cleanly these sections have broken off in their two recent air disasters (air france in brazil, american airlines in new york city), one must also wonder about the integrity and modeling of the aluminum/composite joints in these structures.

    fyi, the aircraft pictured is the Dreamlifter cargo version of the 787 not the Dreamliner.
    Rate this comment: 12345

    curiousengin...
    06/23/2009
    Posts:2
    Avg Rating:
    5/5
    • Re: quick comments
      Further to my post below and quoting "one must also wonder about the integrity and modeling of the aluminum/composite joints in these structures"

      I fully agree with you. With this regard carbon - epoxy interfacial behaviour could be more stable in severe temperature, pressure and humidity (moisture / ice) conditions. This is also due to the research effort and application of glass fibre and carbon fibre based materials in oil, gas, chemical and windmill rotor blade applications.

      Regards,
      Rodney
      Rate this comment: 12345

      rodbennet
      09/02/2009
      Posts:5
  • thanks
    Hopefully the use of composites in structural elements is not a mistake, but thanks for catching our mistake on the photo.  Obviously it's not the 787 since the 787 has not taken it's maiden flight! We are correcting. 
    Rate this comment: 12345

    david.talbot...
    06/23/2009
    Posts:6
    Avg Rating:
    4/5
    • Re: thanks
      Thanks for this interesting article and the feedback.

      Again, this test demonstrates that chemical-physical modeling & computer simulation of composite and laminate structures - consisting of different materials - is still a major challenge. This fact is also sincerely confirmed by the spokesman of Boeing.

      Nevertheless, composite and laminate materials - especially nano carbon based composites - have the future, no doubts about that!

      Kind Regards,
      Rodney Bennet
      Platform for Chemical-Physical Material Simulation
      Rate this comment: 12345

      rodbennet
      09/02/2009
      Posts:5
  • Do we need a new word for the kind of reading we do on a screen?
    Do we need a new word for the kind of reading we do on a screen?

    by Danny Bloom
    OPED

    "Do we read differently on the computer screen from how we read on the
    printed page?" Boston Globe columnist Alex Beam asked readers in a
    recent article.

    From most of the research that has come in so far from academics in
    North America and Europe, the answer is yes, although not everyone's
    in agreement with what it all means.

    For me, what is means is that we need a new word for reading on
    screens. I have therefore coined the neologism "screening". Of course,
    not everyone agrees with me. Are you reading this oped piece in the
    Globe or are you screening it online?

    When I asked Anne Mangen, associate professor
    at the National Center for Reading Research and Education at the
    University of Stavanger in Norway, what she thought about the word
    screening for reading on a screen, she told me by email: "My first
    impression is that the term 'screening' is adequate in some
    respects, but not in others. It's adequate to the extent that it
    points to certain differences in the reading mode which has to do with
    the display nature, the central bias of a screen compared to a page of
    print text (our gaze is naturally oriented towards the center), and
    the image-like character of modalities (we tend to read a screen
    spatially, in contrast to the page which we linearly)."

    But Mangen, who is one of the leading researchers in her field and who
    published an important paper last December in the Journal of Research
    in Reading in Britain, also said that "screening" is not adequate
    "insofar as it does not discriminate between different kinds of
    screening -- we can also screen a print text (scan, filter, skim,
    etc.), and we perceive different kinds of screens differently (compare
    the TV with the cell phone, the e-book with the laptop)."

    Coco Ballantyne, writing for Scientific American online about Mangen's
    paper, noted: "It's no mystery that publications have been
    taking a beating as more and more people read their news on the Net.
    But there's a catch. The online info may be instant and abundant --
    and in many cases free -- but it may come at a cost, says a new study."

    Dr Mangen, in her paper, listed a few reasons that reading on paper
    and reading on a screen are two different animals.

    * Reading on a screen is not as rewarding -- or effective -- as
    reading printed words on paper.

    * The process of reading on a screen involves so much physical
    manipulation of the
    computer that it interferes with our ability to focus on and
    appreciate what we're reading.

    * Online text moves up and down the
    screen and lacks physical dimension, robbing us of a feeling of
    completeness.

    * The visual happenings on a compter screen and our physical interaction
    with the entire device and its set ip can be distracting. All of these things
    tax human cognition and concentration in a way that a book or
    newspaper or magazine does not.

    * The experience of reading a book or a newspaper or a magazine is
    both a story experience and a tactile one.

    The jury's still out on just how different reading on paper is
    from reading on a screen, but the public discussions in the blogsphere
    are getting interesting.

    Richard Long of the International Reading
    Association based in Delaware, told Scientific American that in his opinion
    "more research needs to be done to study the effects of online
    reading on different users .. [and noting that] ....many older people
    may absorb more or learn faster by flipping through pages, because
    their brains have been trained to read hard copy, whereas younger
    readers may learn faster digitally, because they're accustomed to
    working online."

    In the meantime, as the experts conduct more research and write more
    academic papers, I have a hunch that we will need a new word someday
    for reading on screens. It probably won't be "screening", but it's a good word
    to get people thinking.

    When I asked James Fallows, an editor at large for the Atlantic
    Monthly, what he thought about the term, he told me that while the
    word was interesting, he was "not likely
    to be an early
    adopter of "screening" -- and he listed two reasons.

    "First, there is already and established and different meaning of
    'screening' that
    could easily be confused here," Fallows said by email. "The
    meaning I have in mind is similar to
    'skimming,' 'reviewing,' 'categorizing' -- going through material
    quickly to assess its importance, as opposed to fully concentrating on and
    absorbing it."

    He added: "The existing meaning of 'reading' has been independent
    of the medium on
    which the words are displayed. We've used the term to apply to words printed
    on paper; subtitles on a movie screen; words flashed on neon signs; etc. In
    all the cases, regardless of medium, we use 'read' to refer to the act of
    taking in written symbols by eye and converting them mentally to
    words. So, good luck with your idea. I am not opposed to it, but this
    is why I'll
    stick with 'reading' myself."

    So, dear Reader, are you reading this in the Globe today or are you
    screening this online? I would love to hear your answers [at
    danbloom@gmail.com].
    Rate this comment: 12345

    danbloom
    06/23/2009
    Posts:17
    Avg Rating:
    3/5
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